atomic models
... when passed through an evacuated tube (demos). These rays have a small mass and are negative. Thompson noted that these negative subatomic particles were a fundamental part of all atoms. 1) Dalton’s “Billiard ball” model (1800-1900) Atoms are solid and indivisible. 2) Thompson “Plum pudding” model ( ...
... when passed through an evacuated tube (demos). These rays have a small mass and are negative. Thompson noted that these negative subatomic particles were a fundamental part of all atoms. 1) Dalton’s “Billiard ball” model (1800-1900) Atoms are solid and indivisible. 2) Thompson “Plum pudding” model ( ...
Review Questions
... 5. Find the percent composition of Oxygen in Na2S2O3 __________________________ ...
... 5. Find the percent composition of Oxygen in Na2S2O3 __________________________ ...
Midterm Practice Test Answers
... 3. Write the isotope symbol, including atomic number and mass number for the following isotopes. (Isotope symbol ...
... 3. Write the isotope symbol, including atomic number and mass number for the following isotopes. (Isotope symbol ...
bohrmodelofatomclassnote0
... The shells hold the same number of electrons as there are elements in each period (row): 2 – 8 – 8 – 18 electrons Atomic Notation and Drawing Bohr and Lewis Diagrams: Atomic Notation: The mass number of an element tells us the protons and neutrons – these particles both weigh 1 atomic mass unit ...
... The shells hold the same number of electrons as there are elements in each period (row): 2 – 8 – 8 – 18 electrons Atomic Notation and Drawing Bohr and Lewis Diagrams: Atomic Notation: The mass number of an element tells us the protons and neutrons – these particles both weigh 1 atomic mass unit ...
Chapter 2: Elements are the building blocks of matter
... • Organizes the elements according to their physical and chemical properties • The one we use was developed by Dmitri Mendeleev in 1867 ...
... • Organizes the elements according to their physical and chemical properties • The one we use was developed by Dmitri Mendeleev in 1867 ...
Water - School
... Atoms consist of a central ……………………….. containing protons and ……………………… . The nucleus is ……………………. compared to the size of the whole atom. ...
... Atoms consist of a central ……………………….. containing protons and ……………………… . The nucleus is ……………………. compared to the size of the whole atom. ...
Chapter 2 - Faculty Web Pages
... one compound, the ratios of the masses of the second element that combine with 1 gram of the first element can always be reduced to small whole numbers. Ferrous Chloride, 44.06% Fe, 55.94% Cl and Ferric Chloride 34.43% Fe, 65.57% Cl 55.94 g Cl 65.57 g Cl g Cl/1 g Fe = 44.06 g Fe = 1.2696 g Cl/1 g Fe ...
... one compound, the ratios of the masses of the second element that combine with 1 gram of the first element can always be reduced to small whole numbers. Ferrous Chloride, 44.06% Fe, 55.94% Cl and Ferric Chloride 34.43% Fe, 65.57% Cl 55.94 g Cl 65.57 g Cl g Cl/1 g Fe = 44.06 g Fe = 1.2696 g Cl/1 g Fe ...
Early Models of the Atom
... most particles went through the foil, some were deflected at an angle and some bounced straight back Concluded that atom is mostly empty space and has a positive core – discovered the nucleus – came up with the planetary model of the atom – electrons were orbiting, nucleus full of mass (protons) Nam ...
... most particles went through the foil, some were deflected at an angle and some bounced straight back Concluded that atom is mostly empty space and has a positive core – discovered the nucleus – came up with the planetary model of the atom – electrons were orbiting, nucleus full of mass (protons) Nam ...
MORE ABOUT PROTONS, NEUTRONS AND ELECTRONS
... If you take a good look at the Periodic table you will find that the elements all have their mass (weight) recorded in a.m.u. The figure used is the RELATIVE ATOMIC MASS. A definition of this figure is - the weighted mean of naturally occuring atoms of that element. It is very important to refer to ...
... If you take a good look at the Periodic table you will find that the elements all have their mass (weight) recorded in a.m.u. The figure used is the RELATIVE ATOMIC MASS. A definition of this figure is - the weighted mean of naturally occuring atoms of that element. It is very important to refer to ...
Chapter 4 Structure of the Atom An atom is the smallest particle of an
... Democritus is the first person to define an atom. Greek philosopher 2000 years ago. Atom is so small and indestructible that it cannot be divided up into anything smaller. Atom means indivisible in Greek. Law of conservation of mass – ...
... Democritus is the first person to define an atom. Greek philosopher 2000 years ago. Atom is so small and indestructible that it cannot be divided up into anything smaller. Atom means indivisible in Greek. Law of conservation of mass – ...
Chap 11 Sect 1 Notes Atomic Theory
... matter consists of tiny particles called atoms. Atoms cannot be created, divided, or destroyed. All atoms of a given element are identical in mass and properties. The atoms of a given element are different from those of any other element. ...
... matter consists of tiny particles called atoms. Atoms cannot be created, divided, or destroyed. All atoms of a given element are identical in mass and properties. The atoms of a given element are different from those of any other element. ...
The Particle Theory of Matter
... How can we determine the charge of an ion? •For some of the elements it is very easy. Elements in groups 1, 2, 13, 14, 15, 16, & 17 will lose or gain electrons so they have the same # as the nearest Noble Gas (group 18). •The transition metals (groups 3- 12) cannot have their charges predicted in th ...
... How can we determine the charge of an ion? •For some of the elements it is very easy. Elements in groups 1, 2, 13, 14, 15, 16, & 17 will lose or gain electrons so they have the same # as the nearest Noble Gas (group 18). •The transition metals (groups 3- 12) cannot have their charges predicted in th ...
Atomic History
... • Most of the alpha particles passed straight through the foil, some were slightly deflected, while only a few were deflected by 90° or more • Results indicated that the positive charge was small and dense and the electrons were spread out in empty space. • *Rutherford could not explain how the e ...
... • Most of the alpha particles passed straight through the foil, some were slightly deflected, while only a few were deflected by 90° or more • Results indicated that the positive charge was small and dense and the electrons were spread out in empty space. • *Rutherford could not explain how the e ...
8.P.1.1Homework for Website
... 13. Which BEST explains how atoms combine to form compounds? A. The atoms in the compound share electrons B. The atoms in the compound share neutrons C. The atoms in the compound share protons 14. The compound propane has three carbon atoms and eight hydrogen atoms. What is the chemical formula of p ...
... 13. Which BEST explains how atoms combine to form compounds? A. The atoms in the compound share electrons B. The atoms in the compound share neutrons C. The atoms in the compound share protons 14. The compound propane has three carbon atoms and eight hydrogen atoms. What is the chemical formula of p ...
atoms - Wappingers Central School
... • An atom has a small, positively charged nucleus surrounded by a large region in which there are enough electrons to make the atom _______. ...
... • An atom has a small, positively charged nucleus surrounded by a large region in which there are enough electrons to make the atom _______. ...
Script of atoms video
... For uncharged (electrically neutral) atoms: # of protons = # of electrons Re-cap Protons and neutrons are in the nucleus Their combined mass gives the mass of the atom Electrons “orbit” the nucleus Organized in energy shells Electron shells figure 2.5 e- are negatively charged -> attracted to nucleu ...
... For uncharged (electrically neutral) atoms: # of protons = # of electrons Re-cap Protons and neutrons are in the nucleus Their combined mass gives the mass of the atom Electrons “orbit” the nucleus Organized in energy shells Electron shells figure 2.5 e- are negatively charged -> attracted to nucleu ...
Evaluation for Topic 3
... Please fill in the following by ticking the boxes to show how well you have understood topic 3 ...
... Please fill in the following by ticking the boxes to show how well you have understood topic 3 ...
ATOMIC THEORY
... 2. Democritus and Aristotle, around 420 B.C. suggested that matter could be broken down into smaller and smaller components. 3. They coined the term “atoms”, which is Greek for “indivisible”. 4. Atoms were considered tiny particles that could not be seen. B. Quantitative Studies 1. Law of Conservati ...
... 2. Democritus and Aristotle, around 420 B.C. suggested that matter could be broken down into smaller and smaller components. 3. They coined the term “atoms”, which is Greek for “indivisible”. 4. Atoms were considered tiny particles that could not be seen. B. Quantitative Studies 1. Law of Conservati ...
Topic 2: Atomic structure Partial and Long questions Mark scheme 1
... outermost/3p electron has low IE because it is far/furthest from the nucleus; electron(s) in second shell/2p electrons are much closer (to nucleus) and need much more energy to remove/IE much higher/very high/there is a big jump in IE; electron(s) in first/innermost shell/1s electrons are even close ...
... outermost/3p electron has low IE because it is far/furthest from the nucleus; electron(s) in second shell/2p electrons are much closer (to nucleus) and need much more energy to remove/IE much higher/very high/there is a big jump in IE; electron(s) in first/innermost shell/1s electrons are even close ...
Material presented
... Modern Atomic Theory • Bohr’s model of the atom when applied to atoms with more than one electron failed to explain their line spectra • One major change from Bohr’s model is that electrons do not move in orbits • Atomic orbitals - regions in space with a high probability of finding an electron • E ...
... Modern Atomic Theory • Bohr’s model of the atom when applied to atoms with more than one electron failed to explain their line spectra • One major change from Bohr’s model is that electrons do not move in orbits • Atomic orbitals - regions in space with a high probability of finding an electron • E ...
The history of the atomic model
... Neutrons are found in the nucleus They are about the same size as protons They have zero charge ...
... Neutrons are found in the nucleus They are about the same size as protons They have zero charge ...
File
... Some atomic masses may be written as a decimal (e.g. Carbon is actually 12.01, not ‘12’) This is because some elements have atoms with varying numbers of neutrons in the nucleus. ...
... Some atomic masses may be written as a decimal (e.g. Carbon is actually 12.01, not ‘12’) This is because some elements have atoms with varying numbers of neutrons in the nucleus. ...
Chemistry Common Assessment Quarter One
... 2 points well developed explantion 3 points well developed explantion with examples 4 points well developed explanation, examples, and critical connections 54. Explain how the atoms of one element differ from those of another element. 55. Explain why the 4s sublevel fills before the 3d sublevel begi ...
... 2 points well developed explantion 3 points well developed explantion with examples 4 points well developed explanation, examples, and critical connections 54. Explain how the atoms of one element differ from those of another element. 55. Explain why the 4s sublevel fills before the 3d sublevel begi ...