Term
| 3 subatomic particles in atoms |
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Definition
| protons, neutrons, and electrons |
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Term
| who discovered that U ore emits rays that "fog" a photographic plate |
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Definition
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Term
| who isolated new elements (Po & Ra) that emit rays that "fog" a photographic plate, coining this phenomenon radioactivity |
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Definition
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Term
| like charges ____ and opposite charges ______ and uncharged particles are ______ |
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Definition
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Term
| 3 distinct types of radiation discovered |
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Definition
Beta (moves towards +)
Alpha (moves toward -)
gamma (neutral) |
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Term
| atoms must contains smaller _____ |
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Definition
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Term
Beta are what charge?
alpha? |
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Definition
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Term
| who discovered the electron |
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Definition
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Term
| who discovered the charge of an electron |
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Definition
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Term
| what experiment did Thomson do? |
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Definition
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Term
| who did the Cathode rays exp.? |
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Definition
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Term
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Definition
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Term
| what study did Millikan do? |
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Definition
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Term
| who discovered the mass of the electron |
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Definition
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Term
| which has a bigger mass, electron or proton? |
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Definition
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Term
| who said that protons and electrons are arranged in a ball of uniform + charge with small - dots stuck in it |
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Definition
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Term
| who did plum pudding model |
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Definition
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Term
| what experiment did Rutherford do |
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Definition
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Term
who fired alpha particles at thin metal foils expecting them to pass through but had major deflections
what was this exp. called? |
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Definition
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Term
| who came up with the idea of the nucleus |
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Definition
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Term
| who said that most of the mass and all the + charge is in a small core |
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Definition
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Term
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Definition
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Term
| who did the actual experiment with beta particles to find neutrons were ejected |
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Definition
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Term
| neutrons are present in all elements except what |
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Definition
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Term
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Definition
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Term
| significant figues for addition and subtraction= |
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Definition
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Term
| sig. fig.s for multiplication and division |
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Definition
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Term
| all measurement involve what |
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Definition
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Term
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Definition
A=atomic mass
Z=atomic number
X=element |
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Term
protons=
electrons=
neutrons= |
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Definition
atomic#
atomic#
atomic mass-atomic# |
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Term
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Definition
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Term
| atoms of the same element with different mass |
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Definition
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Term
| isotopes have equal # of what and unequal number of what |
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Definition
equal protons
unequal neutrons |
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Term
| for most elements the what of its isotopes are constant |
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Definition
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Term
| atomic weight=what equation |
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Definition
| E(fractional abundance)(isotope mass) |
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Term
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Definition
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Term
| 1 mol He and 1 mol Xe have ______ atoms but different _____ |
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Definition
6.02E23 atoms
masses
(1 dozen peas doesn't have same mass as 1 dozen eggs) |
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Term
| these elements are gray, highly reactive, never found as native metals |
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Definition
| alkali and alkaline earth metals |
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Term
| name of two separate rows in periodic table |
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Definition
| lanthanides and actinides |
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Term
| which group of elements is very reactive nonmetals that form from salts with metals and they are colored |
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Definition
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Term
| which group of elements are colorless, odorless, and have low reactivity |
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Definition
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Term
| who did gold foil experiment |
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Definition
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Term
| Rutherford found 2 things |
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Definition
atom contains nucleus
atom is mostly empty space |
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Term
| millikan did which experiment and which two things? |
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Definition
oil drop
-charge on electron
-mass of electron |
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