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2
|
Positive electric charge
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4
|
A systematic description of an object
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5
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Each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons
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7
|
The state or power of being reactive
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10
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The branch of science that deals with the identification of the substances of which matter is composed
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11
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Large body of matter with no definite shape
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13
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A scientific procedure undertaken to make a discovery
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17
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Physical substance which occupies space
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18
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Relating to an atom
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19
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A thing that represents or stands for something else
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20
|
The central core of an atom
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