Question

write the characteris of groups and periods of modern periodic table​

Answer 1

Answer:

ach period starts with group IA(1) and ends in group VIIIA(0 or 18)

1. Atomic size:

The atomic size decreases from left to right in a period.

Along a period, with increase in atomic number, the number of protons and electrons increases.

So, there is increased force of attraction towards the nucleus. Hence, the atomic size shrinks and decreases.

2.Valence Electrons:

The number of V.Es increases from 1 to 8 along the period.

In 1st period, the increase is from 1 to 2 only.

3. Valency:

 

Along a period from left to right, valency first increases from 1 upto 4 and then decreases upto zero.