Periodic table

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11 Terms

1
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the nucleus is made up of

protons and neutrons

2
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what is an ion

charged atom due to electron loss or gain

3
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protons are

positive

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neutrons are

neutral

5
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electrons are

negative

6
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periods are

rows

7
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groups are

the columns

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atomic mass =

number of protons

9
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atomic number =

protons + neutrons

10
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valence electron

outermost electron on the outermost shell

11
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