Question

Assertion (A): Atomic radius in general decrease along a period. Reason (R): In a period effective nuclear charge decrease​

Answer 1

Answer:

both are true and is the correct explanation also

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Explanation:

Answer 2

Assertion (A) is true but Reason (R) is false.

• It can be observed in the periodic table trends that the size of an atom eventually decreases as we move from left to right across periods. Hence, the given assertion is true.
• The reason behind the decrease in size is the increase in effective nuclear charge on the atom. When valence electrons keep adding themselves on same energy level , the nucleus keeps pulling them tightly towards the centre.
• It is because of strong pull by the nucleus the atomic size keep on decreasing as we move from left to right.
• Hence, the given Reason (R): In a period effective nuclear charge decrease is incorrect.