| Question |
 |
|
| Answer |
|
|
| Charge of electron |
e- |
| Charge of proton |
p+ |
| Charge of neutron |
n0 |
| What is atomic number? |
number of protons or electrons in an atom |
| What is mass number? |
number of protons + number of neutrons in an atom |
| Lucretius |
smaller particles, and a poet |
| Democritus |
world is empty space and atoms, no evidence, philosopher |
| Aristotle |
matter is continuous, Democritus was full of feces |
| Newton and Boyle |
atomic nature of elements, no proof |
| Dalton |
1800's, 1st atomic theory based on proof |
| Dalton's Theory |
All matter is composed of atoms, Atoms of the same element are identical, Atoms of different elements are not identical, Atoms unite in ratios to form compounds, and Atom is the smallest particle |
| Lavoisier |
Law of Conservation of Mass |
| Proust |
Law of Definite Proportions-elements can always combine in the same ratio |
| JJ Thomson |
Discovered the electron, first to use cathode ray tube |
| Goldstein |
Used modified cathode ray tube |
| Millikan |
Discovered mass and charge of ELECTRONS, oil drop experiment |
| Rutherford |
Discover NUCLEUS, gold foil experiment, mostly empty space, small-tense-positively charged |
| Sir James Chadwick |
Discovered NEUTRON, has NO CHARGE, |
| Canal rays later named... |
protons |
| Mass of p+ |
mass of n0, 1 amu |
| Mass of n0 |
mass of p+, 1 amu |
| Mass of e- |
1/1840 amu |
| Isotopes |
elements that have the same number of protons and a different number of neutrons |
| Hydrogen isotopes |
Protium, Deuterium, Tritium |
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