Question

The elements in groups 1, 2 and 13 to 18 are known as Main group elements.

• A. True
• B. False

Answer 1

The correct option is A True

The main group elements of the periodic table are those elements that belong to the $"s"$ and $"p"$ blocks. Counting the columns or table groups across the table ignoring the transition elements gives 8 element groups which match the filling of the eight spaces for electrons in the ns and np subshells, $n{s}^{2}n{p}^6$. The $"s"$ subshell can hold two electrons while the $"p"$ subshell can hold six electrons for a total of eight. One good aspect about the $1A$ to $8A$ group numbering system is that the group number indicates the number of valence ( outer ) electrons for atoms in the main group elements.Hence 1 and $2$ even $13$ to $18$ are called main group elements.