Question

How does the valency of elements vary (1 ) in going down a group, and ( 2 ) in going from left to right in a period of the periodic table?

Answer 1

(1). The valency of the elements does not alter as we move down a group in the periodic table.

• This is because the valency of an element is determined by the number of electrons present in the atom's outer shell.
• Even if the outermost shell varies, a group in the periodic table symbolizes the resemblance of having the same number of valence shell electrons.
• Lithium and Sodium, for example, have different atomic numbers, although they both have valence electron 1 in their outermost shell.

(2).  The valency of elements while going from left to right in a periodic table first increases from 1 to 4 and then tend to decrease from 4 to 1.

• Because of the rise in atomic number or number of electrons, the valence electrons increase in a period from left to right from 1 to 8.
• This occurs because an atom's inclination to gain or lose electrons to attain a stable electrical configuration fluctuates over the period.

Answer 2

Answer:

as we move down the group the valency remains uniform....

element of same group have same no of valence e-

hope it helps