Step-by-step explanation:
To know the periods , groups and blocks of an atom,
you need to first understand the quantum numbers.
How to write the electron configuration of an atom.
Example:
The electron configuration of calcium (Ca)
20Ca. [Ar] 4S2. note: You can write the electron configuration over a noble gas.
therefore we can see that
Period = 4
Group =2
Block = S block.