Chemistry

Problem

There are three elements A, B and C. Their atomic number are

Z_1, Z_2

and

Z_3

respectively. If

Z_1 - Z_2 = 2

and

\frac{Z_1 + Z_2}{2} = Z_3 - 2

and the electronic configuration of element A is

[Ar]3d^6 4s^2

, then correct order of magnetic momentum is/are : a.

B^+ > A^{2+} > C^{2+}

A^{3+} > B^{2+} > C

B > A > C^{2+}

B = A^{3+} > C^{3+}