Question

Out of N, O, Ne, Na, Na⁺select the species which have maximum and minimum ionization energy?

Answer 1

Ionization energy:

• Ionization energy is the minimum energy required by an electron in a gaseous atom or ion to remove it from the outermost valence shell.

Ionization energy trend across periods and groups:

• The ionization energy decreases while moving from top to down in a group.
• The ionization energy increases while moving from left to right in a period.
• N, O, Ne are present in 2nd period
• Na is present in the 3rd period.
• Hence, Na has the minimum ionization energy among these elements.
• The effective nuclear charge of ${\mathrm{Na}}^{+}$ is higher (no. of Proton =11) than Ne (no. of Proton =10).
• Hence, ${\mathrm{Na}}^{+}$ has the maximum ionization energy.

Therefore, out of N, O, Ne, Na, and ${\mathrm{Na}}^{+}$, Na has the minimum ionization energy and ${\mathrm{Na}}^{+}$ has the maximum ionization energy.