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12 Cards in this Set
- Front
- Back
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The __ __ of an element is approximately equal to the sum of the number of protons and neutrons in the nucleus of an element.
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atomic mass
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no. of __ + no. of __ = atomic mass
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no. of protons + no. of neutrons = atomic mass
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Which element does not have any neutrons?
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hydrogen
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How far an electron travels away from the nucleus depends on what?
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The distance an electron travels from the nucleus depends on its energy.
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The first shell of an element can hold ___ electrons.
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2 electrons
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The second shell of an element can hold __ electrons.
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8 electrons
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The third shell of an element can hold ____ electrons.
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18 electrons
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The fourth shell of an element can hold ___ electrons.
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32 electrons
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A ____ atom has an equal number of electrons and protons.
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stable
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Two or more atoms that are chemically united form a ___.
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molecule
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Each element is given a name and a __ __ to identify it.
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chemical symbol
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A chemical symbol always starts with a ____ letter and the second letter is ____.
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capital letter
lowercase letter |
