Question

What are groups and periods in the modern periodic table?

Answer 1

seven period and 18 group

Answer 2

Here's ur answer,

The Vertical columns in the periodic table are called as Groups .

The horizontal rows in the periodic table are called as Periods.

There are 7 periods in the periodic table .
Numbered from 1 to 7.
The 1st period is known as shortest period containing only 2 elements.
The second and third periods are called short periods containing 8 elements each .

The groups are numbered from 1 to 18.
Elements having same number of valence electrons in their outermost orbit are present in the same group.
The group 1 contains alkali metals.
Group 2 contains alkaline earth metals.
Group 17 contains halogens and 18 inert gases.

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