Assertion :Atomic size increases down the group. Reason: Since there are more filled energy levels so the valence electrons are found farther from the nucleus increasing the atomic size.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
The atomic size increases from top to bottom in a group as the atomic number increases. Since there are more filled energy levels so the valence electrons are found farther from the nucleus increasing the atomic size.

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Similar questions

In the following question a statement of assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below in each question.
Assertion (A) Electron gain enthalpy becomes less negative as we go down a group.
Reason. (R) size fo the atom inscreses on going down the group and the added electron would be farther from the nucleus.
(a) Assertion and reason both are correct statement but reason is not correct explanation for assertion.
(b) assertion and reason both are correct statements and reason is correct explanation for assertion .
(c) Assertion and reason both are wrong statements.
(d) Assertion is wrong statement but reason is correct statement.

Q. Assertion : Two electrons of helium atom are placed in only one shell but three electrons of lithium need two shells.
Reason: A shell can have maximum