Question

How would the following properties of the element vary along the period from left to right in the modern periodic table? Give reasons. (a) atomic size (b) metallic character (c) valency

Answer 1

a. atomic size decreases
b. metallic character also decreases
c. valency firstly increase up to four and then decreases after it

Answer 2

Explanation:

It is known that in a periodic table, elements are arranged according to increasing atomic number.

Therefore, as we move from left to right in a periodic table there is a decrease in atomic size of atom.

Also, it is known that in a periodic table metals are placed on the left hand side and non-metals are placed on the right hand side. Therefore, metallic character decreases on going from left to right in a periodic table.

As we go from left to right, firstly there is increase in valency up to group 2 but then there is decrease in valency.