Why does the s-block span two groups of elements? Because s orbitals hold two electrons at most. ... Because the three p orbitals can hold a maximum of six electrons.

Why are there two groups in the s-block?

1) Elements in which the last electron enters the s orbital are called s-block elements. Since s-subshell has only one orbital which can accommodate only two electrons, therefore there are only two groups of s-block elements.

Why are groups 1 and 2 referred to as the s-block?

Answer: The first two vertical columns of the Periodic Table, i.e. Groups 1 and 2, are called the s–block metals, because they only have 1 or 2 electrons in their outer shell.