Atomic radius generally decreases as we move from left to right in a period because:

Effective nuclear charge increases

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Atomic mass increases

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Atomic mass decreases

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Effective nuclear charge decreases

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Solution

The correct option is A
Effective nuclear charge increases

.

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Similar questions

(a) How does the size of atoms (atomic size) generally vary in going from left to right in a period of the periodic table? Why does it vary this way?

(b) What happens to the metallic character of the elements as we move from left to right in a period of the periodic table?

Assertion: The atomic radius decreases as we move from left to right in a period.

Reason: Effective nuclear charge increases across the period from left to right.

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