4
5
6
10
11
4
5
6
10
11
7
8
9
10
18
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7
8
9
10
18
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7
8
9
10
18
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Neon
Sodium
Magnesium
Carbon
Oxygen
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20
21
22
23
24
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10
11
12
21
23
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-2
-1
0
+1
+2
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Ions
Radicals
Isotopes
Acids
Neutrons
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18
19
20
21
22
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18
19
20
21
22
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42
Ca
+2
Ca and 42
Ca, 42, and +2
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