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1
|
unreactive nonmetals that are in group 18
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8
|
the SI unit that expresses the masses of particles in atoms(amu)
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9
|
the number of protons in an atoms nucleus
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11
|
region in an atom where electrons are found
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12
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nonmetal with 4 valence electrons
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13
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very reactive nonmetals that have 7 valence electrons
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14
|
repeating chemical and physical properties of elements change periodically with the elements numbers
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15
|
elements in group one on the periodic table
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17
|
atoms that have the same number of protons but a different number of neutrons
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18
|
each vertical row on the periodic table
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19
|
positively charged particles in the nucleus
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|
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