Question

Which one of the following elements has the least tendency to form cation?(a) Na (b) Ca (c) B (d) Al

Answer 1

Answer:

Explanation:

Na

Answer 2

Answer:

Calcium –“Ca” element has the least tendency to form cation.

Explanation:

Atomic number and electronic configurations of the given elements are as follows:

(a) Na – 11- $1 \mathrm{s}^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{s}^{1}$

(b) Ca – 20- $1 \mathrm{s}^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{s}^{2} 3 \mathrm{p}^{6} 4 \mathrm{s}^{2}$

(c) B – 5- $1 \mathrm{s}^{2} 2 \mathrm{s}^{2} 2 \mathrm{p}^{1}$

(d) Al-13- $1 s^{2} 2 s^{2} 2 p^{6} 3 s^{2} 3 p^{1}$

• From the electronic configurations of the given elements, the calcium element has completely filled electronic configuration.
• They do not able to lose their electrons and form cations then compared to remaining.
• Except calcium all elements has unpaired electron in their energy levels and they can form cations easily.