Find the number of protons, electrons and neutrons in (a) `._(13)^(27)Al^(3+)` (b) `._(8)^(15)O^(2-)`

Answer

(a) `p = 13, e^(-) = 10, n = 14` (b) `p = 8, e^(-) = 10, n = 7`

Explanation

For `._(13)^(27)Al, Z = p = e^(-) = 13, A = 27, :. n = A - Z = 27 - 13 = 14, e^(-) " in " Al^(3+) = 13 - 3 = 10`
For `._(8)^(15)O, Z = p = e^(-) = 8, A = 15:. n = A - Z = 15 - 8 = 7, e^(-) " in " O^(2-) = 8 + 2 = 10`