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16 Cards in this Set
- Front
- Back
The number that represents the average
atomic mass of the element’s isotopes weighted by percentage abundance. |
Atomic weight
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Matter is neither lost nor
gained during a chemical reaction |
Law of conservation of matter
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In a compound, the constituent
elements are always present in a definite proportion by weight |
Law of definite proportions
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Small central core of the atom; contains the
protons and neutrons |
Nucleus
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Negatively charged subatomic particles found in
the space around the nucleus |
Electrons
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Positively charged subatomic particles found in the
nucleus |
Protons
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Electrically neutral subatomic particles found in
the nucleus |
Neutrons
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Spontaneous decomposition of unstable
atomic nuclei; produces alpha, beta, and gamma radiation |
Radioactivity
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Positively charged particles identical to
helium-4 nuclei; emitted by certain radioactive isotopes |
Alpha particles
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Electrons ejected at high speeds from certain
radioactive isotopes |
Beta particles
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High-energy electromagnetic radiation emitted
from radioactive isotopes |
Gamma rays
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The number of protons in the nuclei of
the atoms of an element |
Atomic number
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Number of neutrons plus number of protons
in the nucleus of an atom |
Mass number
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Atoms of the same element having different mass
numbers |
Isotopes
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The unit for relative atomic masses
of the elements; 1 amu 5 1/12 the mass of the carbon-12 isotope. 1 amu 5 1.6605 3 10224 g |
Atomic mass unit (amu)
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The number that represents the average
atomic mass of the element’s isotopes weighted by percentage abundance. |
Atomic weight
|