Which of the following options does not represent ground state electronic configuration of an atom?

1. $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{8}4{\mathrm{s}}^2$

2. $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{9}4{\mathrm{s}}^2$

3. $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{10}4{\mathrm{s}}^1$

4. $1{\mathrm{s}}^{2}2{\mathrm{s}}^{2}2{\mathrm{p}}^{6}3{\mathrm{s}}^{2}3{\mathrm{p}}^{6}3{\mathrm{d}}^{5}4{\mathrm{s}}^1$

The pair of ions having the same electronic configuration is -

1.  Cr³⁺, Fe³⁺

2.  Fe³⁺, Mn²⁺

3.  Fe³⁺, Co³⁺

4.  Sc³⁺, Cr³⁺

Match the following species with their corresponding ground state electronic configuration.

Match the ensuing rules with the corresponding statements

Match species are given in Column I with the electronic configuration given in Column II.

Codes

          A         B          C           D

1.       4          3           1           2

2.       1          2           3           5

3.       5          4           3           2

4.       4          5           3           2