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18 Cards in this Set
- Front
- Back
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What charge does a proton have?
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+1
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What charge does a neutron have?
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none or 0
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What charge does an electron have?
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-1
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What is the exact number of an electronic charge?
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1.602 x 10^(-19)C
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True or False: Atoms may have an electronic charge
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False. Every atom has an equal number of electrons and protons, so atoms have no net electrical charge
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What keeps an electron in the nucleus?
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an electrostatic force that exists between particles of opposite charges
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Where do protons and electrons reside in an atom?
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in the nucleus
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one atomic mass unit =
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1.66504 x 10^(-24)
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True or False: the mass of a proton equals the mass of an electron.
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False. The mass of a proton equals the mass of a neutron. Proton is greater than an electron
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What is the mass of a proton?
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1.0073 amu
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What is the mass of an electron?
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5.486 x 10^(-4)amu
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What is the diameter of most atoms?
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100-500 pm
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What is an angstrom?
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10^(-10)m
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What is the diameter of atomic nuclei?
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10^(-4) A
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What is the biggest difference between elements?
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their subatomic compositions
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What is an atomic number?
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the number of protons in the nucleus of an atom
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What is mass number?
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the number of protons + neutrons
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What are isotopes?
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atoms with the same atomic number, but different mass numbers
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