Question

please solve the question​

Answer 1

Answer:

Electronic Configuration is a fundamental unit of an element and is the most important part in determining its valency. Suppose, we take Oxygen in this case.

Oxygen has 8 electrons in total and has an electronic configuration of 2,6 or, [He] 2s^2 2p^4. Now, in its outermost shell, it has 6 electrons and we know 8 electrons are needed to attain stability. So we can conclude that it therefore, gains 2 electrons and attains the valency of 2-.

This is how electronic configuration act as an integral part in determining valency of an element.

I hope this helps.

Answer 2

Answer:

Two plane figures are congruent if each, when superimposed on the other, covers it exactly. ... Also, if two line segments are congruent, then they have the same length. If two angles have the same measure, they are congruent. Also, if two angles are congruent, their measures are the same.