Answer:
Explanation:
A is Magnesium, B is Aluminium both are adjacent element and lie in third period.
Magnesium with atomic number of 12 consist two s electrons in it's valence shell in ground state whereas, Aluminium which has atomic number of 13 consist three electrons in it's valence shell in the ground state out of which two are s electrons and only one p electron.
The answer is hard to give without any information.
Red
Orange
Yellow
Green
Blue
Indigo
Violet
Red being the longest
Violet the shortest
Answer:
indicates the number of subshells
