Ions: Electron configuration

Question

Write the complete electron configuration for the nickel(II) ion.

Using NOBLE GAS notation write the electron configuration for the chromium(III) ion.

Answer 1

Nickel (Ni) has atomic number 28

Nickel (Ni) is in period 4, group 10 and is a d-block transition element

Neutral Ni has the following electronic configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁸ 4s² (28 electrons)

Nickel(II) ion has the following electronic configuration: 1s² 2s² 2p⁶ 3s² 3p⁶ 3d⁸ (26 electrons)

Chromium (Cr) has atomic number 24

Cr is in period 4, group 6 and is a d-block transition element

Neutral Cr has the following condensed electron configuration: [Ar]3d⁵ 4s¹ (24 electrons)

Cr(III) ion has the following condensed electron configuration: [Ar]3d³ (21 electrons)