Question

Assertion: The most important factor in determining the chemical properties of an element is the number of electrons in the outermost shell.
Statement 2 : The number of electrons in the outer shell determines the bonding characteristics of the element.

• A. Both Assertion and Reason are correct and Reason is the correct explanation of Assertion
• B. Both Assertion and Reason are correct and Reason is not the correct explanation of Assertion
• C. Assertion is correct but Reason is not correct
• D. Assertion is not correct but Reason is correct
• E. Both the Assertion and Reason are not correct

Answer 1

The correct option is A

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

Lets take an example of an element $Ca$:
Electronic configuration of $Ca$ (20 electrons) is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^2$.
Due to having 2 electrons in outermost shell, it is clear that it belongs to second group elements and it is alkaline earth metal.
As this is metal and having 2 electrons in its outermost shell, it can donate 2 electrons and can form ionic compound like $CaC{l}_2$.

Hence, both assertion and reason are correct and reason is the correct explanation of assertion.