Write the electronic configuration of the following:
1. $N a$
2. $C a^{2 +}$
3. $P^{3 -}$
4. $F$

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Solution

1. $N a$ (atomic number 11)
Number of elctrons - 11
E.C. - 2, 8, 1

2. $C a^{2 +}$ (atomic number 20)
Number of electrons - 20-2=18
E.C. - 2, 8, 8

3. $P^{3 -}$ (atomic number - 15)
Number of electrons - 15+3
E.C. - 2, 8, 8

4. $F$ (atomic number 9)
Number of electrons - 9
E.C. - 2, 7

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