Question

Assertion (A): The electronic configuration of magnesium is 2, 8, 2.

Reason (R): The shells in an atom are filled in a stepwise manner.

a) Both A and R are true, and R is the correct explanation of the assertion.

b) Both A and R are true, but R is not the correct explanation of the assertion.

c) A is true, but R is false.

d) A is false, but R is true.​

Answer 1

both. A and R are true . ,and R is correct explanation of Assertion

Answer 2

Explanation:

The main political cause for the great revolt of 1857 was the policy of Doctrine of Lapse. It was an annexation policy purportedly used by Lord Dalhousie as per which any princely state or territory under the British East India Company would automatically be annexed if the ruler died without a male heir.