MOOC Topic 2 CHM092 Electronic Configuration

The correct electron configuration for Fe²⁺ ion is

• [Ar] 4s² 3d⁴

• [Ar] 4s¹ 3d⁵

• [Ar] 3d⁶

• [Kr] 3d⁶

Which is the orbital occupied by the last electron in the Boron element?

• s

• p

• d

• f

Which of the following atoms contains only three valence electrons: Li, B, N, F?

• Li

• B

• N

• F

The electronic configuration of Q⁴⁺ ion is shown below. 1s² 2s² 2p⁶ 3s² 3p⁶.

Choose the correct statement for the atom Q.

• It is located in Period 4.

• It is a Group 14 element.

• It has a low melting point.

• It is a poor electrical conductor.

Calcium has an atomic number of 20.

A stable calcium atom has a electronic configuration of:

• 1s²2s²2p⁶3s²3p⁶4s²

• 3s²3p²

• [Ar] 1f²

• [Ne] 3s²3p⁶