GENERAL KNOWLEDGE

Detailed explanation-1: -As atoms combined to form the first molecules, the universe was finally able to cool and began to take shape. Scientists have inferred that helium hydride was this first, primordial molecule.

Detailed explanation-2: -Of these three, helium was the first to begin forming “real” atoms. An atom is more than a nucleus-it must also possess electrons. Helium nuclei were the first to gather a full purse of electrons en masse. Why not hydrogen or lithium?

Detailed explanation-3: -Light elements like hydrogen and helium formed during the big bang, and those up to iron are made by fusion in the cores of stars. Some heavier elements like gallium and bromine need something more, such as a supernova.