What is the electron configuration for $Al^(+3)$ and $As^-3$ ?

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Answer 1 · 2016-06-11T17:19:54

We follow the standard electron counting scheme.

$Al^(3+), Z=13:$ $1s^(2)2s^(2)2p^(6)$ (the $3s$ and $3p$ electrons have been removed.

$As^(3-), Z=33:$ $1s^(2)2s^(2)2p^(6)3s^(2)3p^(6)3d^(10)4s^(2)4p^(6)$ (the $As^(3-)$ ion thus has the same electronic configuration as $Kr$ .

What is the electron configuration for Al^(+3)Al^(+3) and As^-3As^-3?