Assertion : Alkali metals have least value of ionization energy within a period. Reason : Alkaline earth metals have more IE than alkali metals same period.
- AAssertion is correct, reason is correct; reason is a correct explanation for assertion.
- BAssertion is correct, reason is correct; reason is not a correct explanation for assertion
- CAssertion is correct, reason is incorrect
- DAssertion is incorrect, reason is correct.
✓ Correct answer: B
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