Question

the atomic size in a periodic______ from left to right​

Answer 1

Atomic size gradually decreases from left to right across a period of elements. This is because, within a period or family of elements, all electrons are added to the same shell. However, at the same time, protons are being added to the nucleus, making it more positively charged.

Answer 2

Explanation:

atomic size in a period decreases from left to right