How many electrons are present in 20_X^2+?

Kingsley Thompson January 21, 2026

How many electrons are present in 20_X^2+?

A. 22

B. 20

C. 2

D. 18

The correct answer is:

D. 18

Explanation:
An element with atomic number 20 has 20 electrons when neutral.
If it forms a 2⁺ ion, it loses 2 electrons:

20 - 2 = 18 electrons

So, 20X²⁺ has 18 electrons.

PQN: 24

Tags:
Kingsley Thompson

Posted by: Kingsley Thompson

Schoolarchive is the worldwide leader in educational contents since year 2018. Schoolarchive has been on mission to assist students pass their junior secondary school certificate examination, Cambridge/check point, waec/neco, gce, igcse/A level, jamb, post utme and to assist to be teachers and professional teachers. We cover British/Nigerian curriculum, American/Nigerian curriculum. To learn more about schoolarchive, it's values and it's offering subscribe to our channel to stay informed.

Post a Comment

0 Comments