CSEC Chemistry · May/June 2017 · Paper 1 · Question Q4
An atom has 20 electrons. When it ionizes, it has the same electronic configuration as
- (A)neon
- (B)argon
- (C)sodium
- (D)calcium
The answer is shown once you've answered.
Practise this questionMore practice: the rest of this paper · more Atomic Structure questions · all CSEC Chemistry past papers