Question

which element has 2nd IE < 1st IE...

Answer 1

The element whose valence shell is fully filled or half filled and when we try to remove an electron from fully filled shell then the first ionisation enthalpy will be high and then second ionisation enthalpy will be low

Answer 2

Explanation:

The chemical formula of a carbohydrate is Cx(H2O)y, which denotes some carbons (C) with some water molecules (H2O) attached—hence the word carbohydrate, which means “hydrated carbon.”