Question

How many groups does modern periodic table have​

Answer 1

Answer:

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Explanation:

18 groups

There are 7 periods and 18 groups in the modern periodic table.

1. On moving from left to right in a periodic table, metallic character of elements decreases.  

Metals have a tendency to lose electrons. In a period, atomic size decreases so it becomes difficult to remove the electrons of the outermost shell.

2. On moving from top to bottom in a periodic table, metallic character of element increases.

As we move down the group, atomic size increases so the electron of the outermost shell is easy to remove and hence metallic character of element increases.

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Answer 2

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There are 18 groups in modern periodic table.