Hy!
Steemit Friends!
I am going to describe the important topic of chemistry i.e periods in the periodic table.
The arrangements of elements in horizontal rows of periodic tables are called periods.
- First period is called short period .It consist of only two elements.
- 2nd & 3rd periods are called normal periods .it consists of eight elements each.
- 4th & 5th periods consists of 18 elements each and are called long periods.
- 6th and 7th periods are called very long periods .It consist of 32 elements each .
- 7th period is incomplete .
Thanks.