Question

What are the properties of periods in the modern periodic table?

Answer 1

Number of periods determine no. of shells in an atom. All the elements in a given period have same no. of shells..

Hope it helps..

Answer 2

there are many properties in modern periodic table

1. there are 7 periods and 18 groups

2. in modern periodic table there are 4 blocks called as S-block,P-block,D-block,F-block.

3.In modern periodic table elements are arranged according to their increasing order of atomic numbers.