Match the number of valence electrons with the respective atom

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Solution

The number of valence electrons of an atom is equal to the total number of electrons present in its outermost orbit or shell.

$N a - 3 s^{1} = 1 e l e c t r o n C a - 4 s^{2} = 2 e l e c t r o n s O - 2 s^{2} 2 p^{4} = 6 e l e c t r o n s P - 3 s^{2} 3 p^{3} = 5 e l e c t r o n s$

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