Assertion :The valence electrons of most electropositive elements is 8. Reason: Elements with 8 valence electrons are stable due to completely filled valence shell.

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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Assertion is incorrect, but reason is correct.

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Solution

The correct option is D Assertion is incorrect, but reason is correct.
The most electropositive element is Cesium and it has $1$ valence electron. However the reason statement is true as elements with $8$ electrons in outermost shell are stable elements.

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Assertion :The valence electrons of most electropositive elements is 8. Reason: Elements with 8 valence electrons are stable due to completely filled valence shell.

The correct option is D Assertion is incorrect, but reason is correct.The most electropositive element is Cesium and it has 1 valence electron. However the reason statement is true as elements with 8 electrons in outermost shell are stable elements.

The correct option is D Assertion is incorrect, but reason is correct.
The most electropositive element is Cesium and it has $1$ valence electron. However the reason statement is true as elements with $8$ electrons in outermost shell are stable elements.