Complete the table:

Explanation

Sodium atom: Z = 11, `p = e^(-) = 11, A = p + n = 11 + 12 = 23`
`Al^(3+)` ion : `e^(-) = 10`. Hence, `e^(-) " in " Al = 13, :. Z = p = 13`
`A = 27, :. n= 27 - 13 = 14`
`Cl^(-)` ion: `e^(-) = 18`. Hence, `e^(-) " in " Cl = 17 :. Z = p = 17`
`n = 18, :. A = n + p = 18 + 17 = 35`
P atom: `A 31, p = 15`. Hence, Z = p = 15
`n = A - Z = 31 - 15 = 16`
`Cu^(+)` ion : `e^(-) = 28`. Hence, `e^(-)` in Cu = 29
Z = p = 29
`n = 35 :. A = n + p = 35 + 29 = 64`