Question

When two atoms combine to form molecule then generally:
A. Energy is released
B. Energy is absorbed
C. Energy is neither released nor absorbed
D. Energy may either be released or absorbed

Answer 1

In order to answer the question, to know what happens during the formation of molecules, we should go through the topic structure of atoms. During the formation of molecules, a reaction occurs. And, most of the time, heat is released during the reactions.

Complete answer:
When two atoms combine to form a bond, some heat is always released which is called bond formation energy.
Atoms exist around us-in the air, the Earth and in living things. Normally happening components, for example, oxygen, gold and sodium, are atoms of various structures, and each with a unique number of electrons, protons and neutrons. The protons and neutrons make up the central core of the atom, while the electrons circle the centre in characterized orbitals called energy levels. Not many particles have the amount of electrons they need, so to get their full supplement of electrons, they'll bond with different atoms to form molecules.
Electrons form pairs at the lowest energy level first and work their way outward. An atom with unpaired electrons in the outermost energy level attracts other atoms with unpaired electrons to obtain its full complement of electrons. Unpaired electrons in the most noteworthy energy level are called valence electrons; when the valence electrons from at least two atoms structure sets, they are not lost from one particle and picked up by another. The atoms share their valence electrons and bond together, forming a molecule.
Hence the correct answer is (A).

Note: Atoms, in a sense, are tied together to form molecules. The atoms of molecules are linked together through a reaction known as chemical bonding. A chemical bond is a force that holds atoms together.