The number of groups in modern periodic table?

Q. The number of groups in modern periodic table?

A

7

B

18

C

6

D

8

Solution:

A group is a column of elements in the periodic table of the chemical elements.
Elements having same number of valence electrons are placed in the same group.
The number of periods in modern periodic table – 7.
The longest period – 6 th period .
The shortest period – 1 st period .
The horizontal columns are known as periods in the modern periodic table.
Elements having same number of shells are placed in the same period .

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