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Kennethcelino05go
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Electron shell

1. Li - 1s²2s¹

2. B - [He] 2s2 2p1

3. O - [He] 2s² 2p⁴

4. Na - [Ne] 3s¹

No. of valence electrons

1. Li - 1

2. B - 3

3. O - 6

4. Na - 1

Group of number

1. Li - 1

2. B - 13

3. O - 16

4. Na - 1

Period Number

1. Li - 2

2. B - 2

3. O - 2

4. Na - 3

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