Chemistryhard · Past Paper
Which period contains only 2 elements?
APeriod 1
BPeriod 2
CPeriod 3
DPeriod 4
✓ Correct Answer: A — Period 1
Period 1 contains only Hydrogen and Helium.
Share this question
✓ Correct Answer: A — Period 1
Period 1 contains only Hydrogen and Helium.
Share this question