Question

How does the size of an atom change when we move left to right or across a period in modern periodic table. Give reasons why? ​

Answer 1

Answer:

The atomic radius is the distance from the atomic nucleus to the outermost stable electron orbital in an atom that is at equilibrium. The atomic radius tends to decrease across a period from left to right due to the shrinking of the atom because of increasing effective nuclear force on the electrons.

Explanation:

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Answer 2

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Moving from left to right across a period, atoms become smaller as the forces of attraction become stronger. This causes the electron to move closer to the nucleus, thus increasing the electron affinity from left to right across a period.

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