The electronic configuration of potassium is :

Q. From Electronic configuration from $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^1$ to $1s^{2}2s^{2}2p^{6}3s^{2}3p^{5}4s^2$ an electron would:

Q. Consider two electronic configuration of $K$ (Potassium)
(I) $K=1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^1$
(II) $K=1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^1$
Find the effective nuclear charge experienced by the last electron in (I) and (II).

Q. An element having electronic configuration $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^1$ forms ?

Q. Two electronic configuration of an element 'A' are given below.
(Symbols not real)
$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^1$
$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^1$
(a) Identify the correct electronic configuration.
(b) Write the period in which the element is present in the periodic table.
(c) Consider another element 'C' with sub-shell configuration $1s^{2}2s^{2}2p^{6}3s^1$. In which among the atoms A and C, the attraction of the nucleus towards the outermost electron is more? Give reason.

Q. The electronic configuration of potassium is $2,8,8,1$ and not $2,8,9$.