Question

130. Which electronic configuration indicates
a cation ?
(A) 17p, 17e, 18n
(B) 15e, 16p, 17n
(©) 19e, 20n, 17p
(D) 9p, 10n, 10 e​

Answer 1

Answer: B. 15e, 16p, 17n

Answer 2

Which configuration indicates a cation ?

1. (a) 17p , 17e , 18n
2. (b) 15e, 16p , 17n
3. (c) 19e , 20n , 17p
4. (d) 9p, 10n , 10e

solution : important points :

• electrons are negatively charge subatomic particles
• protons are positively charge subatomic particles
• neutrons are neutral

when an element loss electrons it forms cation and if it gains electron, it forms anion.

for cation ⇒no of protons > no of electrons

for anion ⇒no of protons < no of electrons

for neutral ⇒no of protons = no of electrons

from above explanation we see,

(a) neutral

(b) cation

(c) anion

(d) anion

Therefore option (b) 15e, 16p , 17n , is the configuration which indicates cation.