Name Period _____ Chemistry Review
... ____ 15. A substance that undergoes a chemical change is still the same substance after the change. _________________________ ____ 16. A(n) mixture is made of two or more substances—elements, compounds, or both—that are together in the same place but are not chemically combined. ____________________ ...
... ____ 15. A substance that undergoes a chemical change is still the same substance after the change. _________________________ ____ 16. A(n) mixture is made of two or more substances—elements, compounds, or both—that are together in the same place but are not chemically combined. ____________________ ...
The parts of Dalton`s theory Matter is composed of small, chemically
... Example: Helium has an atomic number of 2. Every helium atom has two protons in its nucleus. - MASS NUMBER: The number of protons PLUS the number of neutrons in the atomic nucleus, Atoms of the same element may have DIFFERENT mass numbers. - ISOTOPES: are atoms of the same element with different mas ...
... Example: Helium has an atomic number of 2. Every helium atom has two protons in its nucleus. - MASS NUMBER: The number of protons PLUS the number of neutrons in the atomic nucleus, Atoms of the same element may have DIFFERENT mass numbers. - ISOTOPES: are atoms of the same element with different mas ...
Science Outline - cloudfront.net
... EX: All Hydrogen has 1 proton in its nucleus. Therefore, its atomic number is always 1. How many protons does an element with an atomic number of 94 have? What is this element? Most matter contains only a few kinds of elements o Ex: hamburgers, gasoline and paper are all made up of: __________ ...
... EX: All Hydrogen has 1 proton in its nucleus. Therefore, its atomic number is always 1. How many protons does an element with an atomic number of 94 have? What is this element? Most matter contains only a few kinds of elements o Ex: hamburgers, gasoline and paper are all made up of: __________ ...
Chapter 12 –Radioactivity
... • Gamma rays are not charged particles like a and b particles. • Gamma rays are electromagnetic radiation with high frequency. • When atoms decay by emitting a or b particles to form a new atom, the nuclei of the new atom formed may still have too much energy to be completely stable. • This excess e ...
... • Gamma rays are not charged particles like a and b particles. • Gamma rays are electromagnetic radiation with high frequency. • When atoms decay by emitting a or b particles to form a new atom, the nuclei of the new atom formed may still have too much energy to be completely stable. • This excess e ...
History - E. R. Greenman
... The mass number (A) is the number of protons plus the number of neutrons (the number of particles in the nucleus). Some atoms of the same element have different A values. This means they have different numbers of neutrons. They are called isotopes. ...
... The mass number (A) is the number of protons plus the number of neutrons (the number of particles in the nucleus). Some atoms of the same element have different A values. This means they have different numbers of neutrons. They are called isotopes. ...
T1 Final Study Guide - District 196 e
... 24. How did Demitri Mendeleev arrange the elements on the periodic table? Atomic Mass 25. How did Henry Mosely arrange the elements on the period table? Atomic Number 26. What are the periodic trends for electronegativity, ionization energy, and atomic radius? Electronegativity- Increases across the ...
... 24. How did Demitri Mendeleev arrange the elements on the periodic table? Atomic Mass 25. How did Henry Mosely arrange the elements on the period table? Atomic Number 26. What are the periodic trends for electronegativity, ionization energy, and atomic radius? Electronegativity- Increases across the ...
Atomic Structure and Periodic Table Quick Notes
... (making it Neutrally Charged) Two types of Atoms: Ions- these are atoms that have LOST or GAINED an ELECTRON during a chemical reaction If an atom loses an electron, it becomes a Positive Ion If an atom gains an electron, it becomes a Negative Ion Ex: when Na reacts with Cl to form NaCl, the Na ...
... (making it Neutrally Charged) Two types of Atoms: Ions- these are atoms that have LOST or GAINED an ELECTRON during a chemical reaction If an atom loses an electron, it becomes a Positive Ion If an atom gains an electron, it becomes a Negative Ion Ex: when Na reacts with Cl to form NaCl, the Na ...
Ch. 5 Outline Notes
... 1. ____________________ – 4th century BC – world made up of empty space and tiny particles called _______________ (atomos) ‘indivisible’ a. Hypothesized _________________ using experiments B. __________________ Atomic Theory 1. All matter is made of ________________ 2. Atoms are ____________________ ...
... 1. ____________________ – 4th century BC – world made up of empty space and tiny particles called _______________ (atomos) ‘indivisible’ a. Hypothesized _________________ using experiments B. __________________ Atomic Theory 1. All matter is made of ________________ 2. Atoms are ____________________ ...
Page 1
... 1. The ancient Greek philosopher, Democritus, believed that all matter consisted of extremely small particles that could not be divided. 2. The Greek philosopher, mentioned in the previous question, thought that there were different types of atoms with specific sets of properties. (true, false) 3. A ...
... 1. The ancient Greek philosopher, Democritus, believed that all matter consisted of extremely small particles that could not be divided. 2. The Greek philosopher, mentioned in the previous question, thought that there were different types of atoms with specific sets of properties. (true, false) 3. A ...
Ch 11 Atoms etc GNC
... What particles make up an atom in the electron cloud model, and what electrical charges do they have? Electrons—negatively charged; protons—positively charged; neutrons—electrically neutral Section 2 The Simplest Matter A. Elements—materials that cannot be broken down into simpler materials 1. There ...
... What particles make up an atom in the electron cloud model, and what electrical charges do they have? Electrons—negatively charged; protons—positively charged; neutrons—electrically neutral Section 2 The Simplest Matter A. Elements—materials that cannot be broken down into simpler materials 1. There ...
Inside the Atom 1. Atom – greek for cannot be divided. Democritus
... a. In the 1800s, scientists discovered that all matter is made up of elements either in pure form Au, Ag or Fe, or in combinations such as the molecules of H2O & NaCl b. 1st Model: Dalton – proposed that the atom was a hard sphere which was the same all the way through. Dalton’s idea of what atoms ...
... a. In the 1800s, scientists discovered that all matter is made up of elements either in pure form Au, Ag or Fe, or in combinations such as the molecules of H2O & NaCl b. 1st Model: Dalton – proposed that the atom was a hard sphere which was the same all the way through. Dalton’s idea of what atoms ...
Chemical reactions revision
... A name ending in ‘...ide’ means that the compound contains two elements A name ending in ‘...ate’ means that the compound contains three elements and one is oxygen. ‘Oxygen’ does not show up in the name; the ‘ate’ is the only clue it is there You should be able to give the name of the compound forme ...
... A name ending in ‘...ide’ means that the compound contains two elements A name ending in ‘...ate’ means that the compound contains three elements and one is oxygen. ‘Oxygen’ does not show up in the name; the ‘ate’ is the only clue it is there You should be able to give the name of the compound forme ...
CHAPTER 3: The Building Blocks of Matter
... II. Early Research on Atomic Particles□______________ (1897)- used a cathode ray tube to prove the existence of _____________ charged subatomic particles called _____________. See Figure 3-4, page 70. □_________________ (1909)- his‘Oil Drop Experiment’ used a device to prove that the charge of an el ...
... II. Early Research on Atomic Particles□______________ (1897)- used a cathode ray tube to prove the existence of _____________ charged subatomic particles called _____________. See Figure 3-4, page 70. □_________________ (1909)- his‘Oil Drop Experiment’ used a device to prove that the charge of an el ...
CHEMISTRY The Molecular Science
... Dalton’s Atomic Theory • An element is composed of tiny particles called atoms. All atoms of a given element show the same chemical properties. • Atoms of different elements have different properties. • Compounds are formed when atoms of two or more elements combine. In a given compound, the relati ...
... Dalton’s Atomic Theory • An element is composed of tiny particles called atoms. All atoms of a given element show the same chemical properties. • Atoms of different elements have different properties. • Compounds are formed when atoms of two or more elements combine. In a given compound, the relati ...
Test Review Answers File
... -helium, neon, argon, krypton, xenon, radon 9. List which elements are chemically similar to Beryllium. Explain why. Magnesium, calcium, strontium, barium, radon are all chemically similar to Beryllium. Elements in the same group have the same chemical properties. 10. Fill in the blank: Atoms are ne ...
... -helium, neon, argon, krypton, xenon, radon 9. List which elements are chemically similar to Beryllium. Explain why. Magnesium, calcium, strontium, barium, radon are all chemically similar to Beryllium. Elements in the same group have the same chemical properties. 10. Fill in the blank: Atoms are ne ...
Chapter 4 Structure of the Atom An atom is the smallest particle of an
... __________; in particular, they all have the same _________. 3. Atoms of different elements are ____________; in particular, they have different masses. 4. Compounds are formed by the joining of atoms of two or more elements. In any compound, the atoms of the different elements in the compound are j ...
... __________; in particular, they all have the same _________. 3. Atoms of different elements are ____________; in particular, they have different masses. 4. Compounds are formed by the joining of atoms of two or more elements. In any compound, the atoms of the different elements in the compound are j ...
Periodic Scavenger Hunt - bates
... 8. The atomic mass of an element is a combination of the number of protons and neutrons. Because the same element does not always have the same number of neutrons, the atomic mass is an average mass of the element as it occurs in nature. What is the atomic mass of fluorine? ...
... 8. The atomic mass of an element is a combination of the number of protons and neutrons. Because the same element does not always have the same number of neutrons, the atomic mass is an average mass of the element as it occurs in nature. What is the atomic mass of fluorine? ...
Earth Chemistry
... Electrons dictate the many properties of a material including chemical reactivity and physical attributes, like taste, texture, appearance and color. ...
... Electrons dictate the many properties of a material including chemical reactivity and physical attributes, like taste, texture, appearance and color. ...
Chapter 1
... B. Now for Some Neutrons C. Building Bigger Atoms D. Protons and Atomic Number *Notes-The number of protons in the nucleus of an atom give the element its _____________________. (also the number of electrons) ...
... B. Now for Some Neutrons C. Building Bigger Atoms D. Protons and Atomic Number *Notes-The number of protons in the nucleus of an atom give the element its _____________________. (also the number of electrons) ...
atomic number
... Dalton’s Atomic Theory – Atoms of different elements can be distinguished by their different masses – Compounds are combinations of atoms of different elements and possess properties different from those of their component elements – In chemical reactions, atoms are neither created nor destroyed bu ...
... Dalton’s Atomic Theory – Atoms of different elements can be distinguished by their different masses – Compounds are combinations of atoms of different elements and possess properties different from those of their component elements – In chemical reactions, atoms are neither created nor destroyed bu ...
Electron Configuration, Noble Gas Configuration
... 2. How do the changes that occur to atoms effect the properties of those atoms? Overview: In this short unit we will see how the periodic table can be used to deepen our understanding of atom models. We will see that even atoms of the same element can be different. Isotopes are atoms of the same ele ...
... 2. How do the changes that occur to atoms effect the properties of those atoms? Overview: In this short unit we will see how the periodic table can be used to deepen our understanding of atom models. We will see that even atoms of the same element can be different. Isotopes are atoms of the same ele ...
Unit-2.-Objectives
... Recall a very brief history of Atomic Theory Know and understand the five main aspects of Dalton’s Atomic Theory Recall some of the experiments that led to the identification of sub-atomic particles Know the three particles that make up the atom and their relative charges, masses and positions in th ...
... Recall a very brief history of Atomic Theory Know and understand the five main aspects of Dalton’s Atomic Theory Recall some of the experiments that led to the identification of sub-atomic particles Know the three particles that make up the atom and their relative charges, masses and positions in th ...
The Atom - Riverside City College
... • Heteronuclear Diatomic Molecule: a molecule made of two atoms that are different elements – NO ...
... • Heteronuclear Diatomic Molecule: a molecule made of two atoms that are different elements – NO ...
Unit 2
... • Determined the ratio of the charge to the mass of an electron. • Used these values to calculate an accurate value for the mass of an electron. • Reported this mass in 1916 as 1/1840th the mass of a hydrogen atom. ...
... • Determined the ratio of the charge to the mass of an electron. • Used these values to calculate an accurate value for the mass of an electron. • Reported this mass in 1916 as 1/1840th the mass of a hydrogen atom. ...
Neptunium
Neptunium is a chemical element with symbol Np and atomic number 93. A radioactive actinide metal, neptunium is the first transuranic element. Its position in the periodic table just after uranium, named after the planet Uranus, led to it being named after Neptune, the next planet beyond Uranus. A neptunium atom has 93 protons and 93 electrons, of which seven are valence electrons. Neptunium metal is silvery and tarnishes when exposed to air. The element occurs in three allotropic forms and it normally exhibits five oxidation states, ranging from +3 to +7. It is radioactive, pyrophoric, and can accumulate in bones, which makes the handling of neptunium dangerous.Although many false claims of its discovery were made over the years, the element was first synthesized by Edwin McMillan and Philip H. Abelson at the Berkeley Radiation Laboratory in 1940. Since then, most neptunium has been and still is produced by neutron irradiation of uranium in nuclear reactors. The vast majority is generated as a by-product in conventional nuclear power reactors. While neptunium itself has no commercial uses at present, it is widely used as a precursor for the formation of plutonium-238, used in radioisotope thermal generators. Neptunium has also been used in detectors of high-energy neutrons.The most stable isotope of neptunium, neptunium-237, is a by-product of nuclear reactors and plutonium production. It, and the isotope neptunium-239, are also found in trace amounts in uranium ores due to neutron capture reactions and beta decay.