Question

In the periodic table, elements of period 3 are arranged in increasing order of ionisation energy as:

Options

• Mg, Si, S, Ar

• B, Cl, Ar, N

• Si, Ar, Cl, Mg

• Mg, S, Si, Ar

Answer 1

Mg, Si, S, Ar

Explanation:

Ionization energy increases from left to right across a period due to an increase in nuclear charge and a decrease in atomic size. In Period 3, the correct left-to-right order for these elements is Magnesium (Mg) → Silicon (Si) → Sulphur (S) → Argon (Ar).