Elements which belong to the same group in the Periodic Table are characterized by
- difference of +1 in the oxidation numbers of successive members
-
presence of the same number of outermost electrons in the respective atoms
- difference of 14 atomic mass units between successive members
- presence of the same number of electron shells in the respective atoms
The correct answer is: B
Explanation
Elements in the same group have the same number of valence electron in their outermost shell while elements in the same period have the same number of shells.