Question

in periodic table ( in period and group) how the size of atom changes explain​

Answer 1

Answer:

the size of atom decreases as we move in a period from left to right exception noble gas size is largest in the period.

the size of atom increase when we move down in group except for Al>Ga in group 13.

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Answer 2

Answer:

• In Period-

On moving from left to right in a period, the atomic size decreases. More and more electrons are added to same shell. The attraction between nucleus and valence electrons increases with increase in the atomic number.

• In Group-

On moving down the group, from top to bottom, the atomic size increases. This is because with increase in the atomic number, extra shells of electrons are added.