Nuclear Chemistry
... protons, it would take more neutrons to help hold the nucleus together Remember - all elements above Bismuth (83) are radioactive! If the atomic number is less than 83, radioactivity will be determined by the number of protons and neutrons ...
... protons, it would take more neutrons to help hold the nucleus together Remember - all elements above Bismuth (83) are radioactive! If the atomic number is less than 83, radioactivity will be determined by the number of protons and neutrons ...
2.4 Revision 1: There were two atoms. One got hit by an extremely
... a. Has the highest melting point? b. Has the lowest melting point? c. Conducts electricity when solid and melted? d. Conducts electricity when dissolved or melted but not as a solid? e. Forces that hold non-polar molecular solids together. f. Can conduct heat and electrical charge. g. Which of the f ...
... a. Has the highest melting point? b. Has the lowest melting point? c. Conducts electricity when solid and melted? d. Conducts electricity when dissolved or melted but not as a solid? e. Forces that hold non-polar molecular solids together. f. Can conduct heat and electrical charge. g. Which of the f ...
Ch. 2: The Chemical Context of Life AP Reading Guide
... 1. Define and give an example of the following terms: matter, element, compound. 2. What four elements make up 96% of all living matter? 3. What is the difference between an essential element and a trace element? Concept 2.2 An element’s properties depend on the structure of its atoms 4. Sketch a mo ...
... 1. Define and give an example of the following terms: matter, element, compound. 2. What four elements make up 96% of all living matter? 3. What is the difference between an essential element and a trace element? Concept 2.2 An element’s properties depend on the structure of its atoms 4. Sketch a mo ...
1st Semester Final Exam Review Guide
... 9. Define “isotope”. Give an example of 2 isotopes of a particular element. 1. In Bohr’s model of the atom, electrons that gain energy become “excited”. When these electrons drop to a lower energy level, they release energy in the form of ___________________. 2. Write the electron configuration for ...
... 9. Define “isotope”. Give an example of 2 isotopes of a particular element. 1. In Bohr’s model of the atom, electrons that gain energy become “excited”. When these electrons drop to a lower energy level, they release energy in the form of ___________________. 2. Write the electron configuration for ...
Atomic Radii Answers File
... (c) increases When an atom loses an electron to form a positive ion, the nuclear charge has not changed. However, now the nucleus is attracting one less electron so the remaining ones are pulled in closer. When an atom gains an electron to form a negative ion, the nuclear charge has not changed. How ...
... (c) increases When an atom loses an electron to form a positive ion, the nuclear charge has not changed. However, now the nucleus is attracting one less electron so the remaining ones are pulled in closer. When an atom gains an electron to form a negative ion, the nuclear charge has not changed. How ...
Exercises 2
... Even Demokrit’s atomic model may be useful to explain certain experimental results. Name an experimental observation which can be fully explained by Demokrit’s idea about matter. ...
... Even Demokrit’s atomic model may be useful to explain certain experimental results. Name an experimental observation which can be fully explained by Demokrit’s idea about matter. ...
Chemistry 2: matter is made up of atoms
... • J.J. Thomson, in 1897, discovered the electron using the cathode-ray tube, and that electrons are negatively charged • Rutherford’s gold foil experiments showed that atoms have positively charged nuclei • Thomson’s atomic model: electrons embedded in a ball of positive charge • Nagaoka’s atomic mo ...
... • J.J. Thomson, in 1897, discovered the electron using the cathode-ray tube, and that electrons are negatively charged • Rutherford’s gold foil experiments showed that atoms have positively charged nuclei • Thomson’s atomic model: electrons embedded in a ball of positive charge • Nagaoka’s atomic mo ...
give and take File
... Find someone in the class to swap with….You give them an answer and they give one to you. (Use each classmate only once. ) Have them initial your answer after you write it down. ...
... Find someone in the class to swap with….You give them an answer and they give one to you. (Use each classmate only once. ) Have them initial your answer after you write it down. ...
Electrons
... showed that neutrons are made from other particles called quarks. Neutrons are made from one 'up' quark and two 'down' quarks. ...
... showed that neutrons are made from other particles called quarks. Neutrons are made from one 'up' quark and two 'down' quarks. ...
Prelim Revision Paper 4
... The table shows the numbers of protons, electrons and neutrons in four particles, W, X, Y and Z. ...
... The table shows the numbers of protons, electrons and neutrons in four particles, W, X, Y and Z. ...
Bohr Model Notes - Northwest ISD Moodle
... levels (orbitals) outside the nucleus. 2 electrons can fit in the first energy level. 8 electrons can fit in the second energy level. 18 electrons can fit in the third energy level. Valence Electrons – electrons found in the outermost energy levels. Magnesium has 2 valence electrons. Rule of E ...
... levels (orbitals) outside the nucleus. 2 electrons can fit in the first energy level. 8 electrons can fit in the second energy level. 18 electrons can fit in the third energy level. Valence Electrons – electrons found in the outermost energy levels. Magnesium has 2 valence electrons. Rule of E ...
Grade 9 Chemistry Unit Test Name: Part A: Multiple Choice (15
... d) Antoine Lavoisier _____ 2. Which group of “scientists” was very hands-on, but also very secretive? a) Francis Bacon b) Joseph Proust c) The Alchemists d) Antoine Lavoisier _____ 3. Which scientist first defined elements as pure substances and identified 23 new elements? a) Francis Bacon b) Joseph ...
... d) Antoine Lavoisier _____ 2. Which group of “scientists” was very hands-on, but also very secretive? a) Francis Bacon b) Joseph Proust c) The Alchemists d) Antoine Lavoisier _____ 3. Which scientist first defined elements as pure substances and identified 23 new elements? a) Francis Bacon b) Joseph ...
Chapter 2
... a) atomic number b) atomic mass c) number of electrons d) number of protons e) none of the above 9. A particular carbon isotope has an atomic number of 6 and an atomic mass of 14. The respective number of neutrons, protons, and electrons that this carbon isotope has is _____. (Concept 2.2 ) a) 6, 8, ...
... a) atomic number b) atomic mass c) number of electrons d) number of protons e) none of the above 9. A particular carbon isotope has an atomic number of 6 and an atomic mass of 14. The respective number of neutrons, protons, and electrons that this carbon isotope has is _____. (Concept 2.2 ) a) 6, 8, ...
Atoms, Molecules and Ions Conservation of mass and Law of
... Elements are made of tiny particles called atoms Atoms of the same element have the same mass. Atoms of different elements have different masses. Chemical combination of elements to make different substances occurs when atoms join together in simple whole numbers. Atoms are chemically indestructible ...
... Elements are made of tiny particles called atoms Atoms of the same element have the same mass. Atoms of different elements have different masses. Chemical combination of elements to make different substances occurs when atoms join together in simple whole numbers. Atoms are chemically indestructible ...
UNIT 3 VOCABULARY MATCHING and mole problems
... ____ 2.) equal to the number of protons in an atom; whole number on the Periodic Table ____ 3.) equal to the number of protons plus the number of neutrons in an atom ____ 4.) discovered the electron using a cathode ray tube ____ 5.) atoms of the same element, but have different masses ____ 6.) negat ...
... ____ 2.) equal to the number of protons in an atom; whole number on the Periodic Table ____ 3.) equal to the number of protons plus the number of neutrons in an atom ____ 4.) discovered the electron using a cathode ray tube ____ 5.) atoms of the same element, but have different masses ____ 6.) negat ...
Chapter 9: Nuclear Chemistry
... because of the ___________________ of the nucleus. b. The probability of hitting the nucleus is ____________ as the size of the nucleus ____________. The smallest size the nucleus can be to keep the chain reaction going is called the ____________________. The accident at Chernobyl was a result of a ...
... because of the ___________________ of the nucleus. b. The probability of hitting the nucleus is ____________ as the size of the nucleus ____________. The smallest size the nucleus can be to keep the chain reaction going is called the ____________________. The accident at Chernobyl was a result of a ...
Atoms and Nuclei
... (An atom from which one or more electrons has been removed is called an ion and will be positively charged. Negative ions, with an excess electron, are also possible.) Electrons, Radiation, and Chemistry: • One must add energy to the motion of an electron to move it to a higher energy (i.e., larger) ...
... (An atom from which one or more electrons has been removed is called an ion and will be positively charged. Negative ions, with an excess electron, are also possible.) Electrons, Radiation, and Chemistry: • One must add energy to the motion of an electron to move it to a higher energy (i.e., larger) ...
topic 1 sol review homework
... all are diatomics, all have 7 valence electrons, all are halogens 9. The increase in atomic radius of each successive element within a group is due to an increase in the number of a) neutrons b) valence electrons c) unpaired electrons d) principle energy levels 10. According to the modern periodic t ...
... all are diatomics, all have 7 valence electrons, all are halogens 9. The increase in atomic radius of each successive element within a group is due to an increase in the number of a) neutrons b) valence electrons c) unpaired electrons d) principle energy levels 10. According to the modern periodic t ...
Chemistry Exam – Matter and Change, Atomic Structure, and
... 34) Suppose you are going to begin a scientific investigation. What should be the first thing everyone in your group does? a) Read the directions b) make an observation c) mix chemicals d) ...
... 34) Suppose you are going to begin a scientific investigation. What should be the first thing everyone in your group does? a) Read the directions b) make an observation c) mix chemicals d) ...
Section 1 Atoms, Elements, and Compounds
... Neutrons- neutral charged particle in the nucleus Electrons- negatively charged particles that orbit the nucleus. Very small. o Energy Levels- 2 electrons in first energy level. 8 in every level after that o Valence- Outermost, used in chemical bonds What makes an atom neutral? Elements What i ...
... Neutrons- neutral charged particle in the nucleus Electrons- negatively charged particles that orbit the nucleus. Very small. o Energy Levels- 2 electrons in first energy level. 8 in every level after that o Valence- Outermost, used in chemical bonds What makes an atom neutral? Elements What i ...
topic-2.doc
... Atom:smallest possible unit of matter that retains properties of its element o Neutrons: no charge (neutral) o Protons: +1 electrostatic charge o Electrons: -1 electrostatic charge Electrically neutral atoms have an equal number of protons and electrons Atomic number: number of protons in an atom ...
... Atom:smallest possible unit of matter that retains properties of its element o Neutrons: no charge (neutral) o Protons: +1 electrostatic charge o Electrons: -1 electrostatic charge Electrically neutral atoms have an equal number of protons and electrons Atomic number: number of protons in an atom ...
Chemical Bonds
... The octet rule states that elements gain or lose electrons to attain an electron configuration of the nearest noble gas. ...
... The octet rule states that elements gain or lose electrons to attain an electron configuration of the nearest noble gas. ...
Chemistry - nyostrander.us
... 3. State the model that first included electrons as subatomic particles. [2] The Thomson model first included electrons (the negatively charged particles). _________________________________________________________________________ 4. State one conclusion about the internal structure of the atom that ...
... 3. State the model that first included electrons as subatomic particles. [2] The Thomson model first included electrons (the negatively charged particles). _________________________________________________________________________ 4. State one conclusion about the internal structure of the atom that ...
Document
... a. proton, neutron & electron b. quarks and other subatomic particles C. Atomic Number, Mass Number, Atomic Mass, & Isotopes i. know meaning of each and how to use to find out information about the structure of the atom. (such as # of p+’s. n0’s & e–‘s; charges, identities of elements, etc.) ii. how ...
... a. proton, neutron & electron b. quarks and other subatomic particles C. Atomic Number, Mass Number, Atomic Mass, & Isotopes i. know meaning of each and how to use to find out information about the structure of the atom. (such as # of p+’s. n0’s & e–‘s; charges, identities of elements, etc.) ii. how ...
Name: Date: Block:______ GRADE 8 SCIENCE SOL QUESTIONS
... 1. Which process is a physical change? a. Rusting iron b. Burning coal c. Tarnishing silver d. Melting ice _ 2. When a base is mixed with an acidic solution, neutralization occurs because the — a. base reaches absolute zero b. acid evaporates c. base chemically reacts with the acid d. mass of the so ...
... 1. Which process is a physical change? a. Rusting iron b. Burning coal c. Tarnishing silver d. Melting ice _ 2. When a base is mixed with an acidic solution, neutralization occurs because the — a. base reaches absolute zero b. acid evaporates c. base chemically reacts with the acid d. mass of the so ...
Proton
The proton is an elementary subatomic particle, symbol p or p+, with a positive electric charge of +1e elementary charge and mass slightly less than that of a neutron. Protons and neutrons, each with mass approximately one atomic mass unit, are collectively referred to as ""nucleons"". One or more protons are present in the nucleus of an atom. The number of protons in the nucleus is referred to as its atomic number. Since each element has a unique number of protons, each element has its own unique atomic number. The word proton is Greek for ""first"", and this name was given to the hydrogen nucleus by Ernest Rutherford in 1920. In previous years Rutherford had discovered that the hydrogen nucleus (known to be the lightest nucleus) could be extracted from the nuclei of nitrogen by collision. The proton was therefore a candidate to be a fundamental particle and a building block of nitrogen and all other heavier atomic nuclei.In the modern Standard Model of particle physics, the proton is a hadron, and like the neutron, the other nucleon (particle present in atomic nuclei), is composed of three quarks. Although the proton was originally considered a fundamental particle, it is composed of three valence quarks: two up quarks and one down quark. The rest masses of the quarks contribute only about 1% of the proton's mass, however. The remainder of the proton mass is due to the kinetic energy of the quarks and to the energy of the gluon fields that bind the quarks together. Because the proton is not a fundamental particle, it possesses a physical size; the radius of the proton is about 0.84–0.87 fm.At sufficiently low temperatures, free protons will bind to electrons. However, the character of such bound protons does not change, and they remain protons. A fast proton moving through matter will slow by interactions with electrons and nuclei, until it is captured by the electron cloud of an atom. The result is a protonated atom, which is a chemical compound of hydrogen. In vacuum, when free electrons are present, a sufficiently slow proton may pick up a single free electron, becoming a neutral hydrogen atom, which is chemically a free radical. Such ""free hydrogen atoms"" tend to react chemically with many other types of atoms at sufficiently low energies. When free hydrogen atoms react with each other, they form neutral hydrogen molecules (H2), which are the most common molecular component of molecular clouds in interstellar space. Such molecules of hydrogen on Earth may then serve (among many other uses) as a convenient source of protons for accelerators (as used in proton therapy) and other hadron particle physics experiments that require protons to accelerate, with the most powerful and noted example being the Large Hadron Collider.