Question

How many groups and periods are there in the long form periodic table? How are these numbered? How many elements are there in each period?

Answer 1

Number of groups and periods in a periodic table:

1.The periods are the horizontal rows in a periodic table, and the groups are the vertical columns in a periodic table.

2.There are a total of $8$ periods, that extend from $1$ to $8.$

3.There are a total of $18$ groups, that extend from $1$ to $18.$

Numbering of the periods and groups are done as:

1.The groups are numbered from $0$ to $VIII$. They are in the order: $IA,IIA,IIIB,IVB,VB,VIB,VIIB,VIII,IB,IIB,IIIA,IVA,VA,VIA,VIIA,$ and $0.$

2.The periods are numbered from $1$ to $7$ in a periodic table.

Number of elements in each period:

1.In the $1st$ period there are $2$ elements.

2.In the $2nd$ and $3rd$ period there are$8$ elements each.

3.In the $4th$ and $5th$ period there are $18$elements each.

4.In the $6th$ and $7th$ period there are $32$ elements each.