Question

The atomic numbers of four elements A, B, C and D are 6, 8, 10 and 12 respectively. The two elements which can react to form ionic bonds (or ionic compound) are ______.

Options

• A and D

• B and С

• A and С

• B and D

Answer 1

The atomic numbers of four elements A, B, C and D are 6, 8, 10 and 12 respectively. The two elements which can react to form ionic bonds (or ionic compound) are B and D.

Explanation:

Element B (atomic number 8) has a configuration of 2, 6 and needs 2 electrons to be stable, making it a non-metal. Element D (atomic number 12) has a configuration of 2, 8, 2 and needs to lose 2 electrons, making it a metal. When they react, D transfers its 2 valence electrons to B, forming an ionic bond.