Question

atomic size decteases across period and increases along group give reason​

Answer 1

1. It decreases along the period because from left to right in a period, the number of shells are constant but the nuclear charge increases so the atomic size decreases.

2. In a group, when we move from top to bottom the number of valence electron is same but the number of electron containing shells increases so it results in the increase in atomic size.

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Answer 2

Answer:

Step-by-step explanation:

The atomic size decreases across a period because the number of atoms are added on the same shell,the distance between the atom of valence shell and nucleus is small and the nuclear forces of attraction pulls it closer decreasing the size of the atom

The atomic size increases along a group as new shells are being added up and the distance between the nucleus and atom of the last shell is longer which decreases the size of the atom due to decrease in the nuclear forces of attraction