Question

what are the valence electron? for S- block and P- block elements show that number of valence electrons is equal to its group number.​

Answer 1

Explanation:

Valence electrons are defined as the electrons that are present in the outermost shell of an atom.

S-block elements are defined as the elements in which the last electron enters the s-orbital. The number of valence electrons of 's'-block elements is equal to the group number.

P-block elements are defined as the elements in which the last electron enters the p-orbital. The number of valence electrons of 'p'-block elements is given by the equation:

Number of valence electrons = Group number - 10

The factor of 10 arises due to the presence of 'd'-block elements in between s-block and p-block elements.