Answer
See the answer below.
Work Step by Step
K: group 1, period 4
$[Ne]\ 3s^2\ 3p^6\ 4s^1$
$K^+: [Ne]\ 3s^2\ 3p^6$
$K^{2+}: [Ne]\ 3s^2\ 3p^5$
In the second ionization energy, an electron would have to be removed from an inner shell and break a noble gas electronic configuration.
