Assertion :One of the most important factors in determining the chemical properties of an elements is the number of electrons in its outermost shell.
Reason: The number of electrons in the outer shell determines the bonding characteristics of an element.

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
1.True.The electrons in the outermost occupied shell (or shells) determine the chemical properties of the atom it is called the valence shell.A given element's reactivity is highly dependent upon its electronic configuration.
2. True.Ionic or covalent bonding depends on the outer valence electrons

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