Answer:
option A= electrons
Step-by-step explanation:
The molecules is formed when two or more atoms combine together through chemical bond. The atoms can be from same elements or from different elements. When atoms shares the electron a covalent bond is formed.
For example:
In hydrogen molecule H2 the two atom of hydrogen share their electrons and form a bond.
H· + H· → H-H OR ( H:H)
The force of attraction is electrostatic, between these two atoms.
The molecule can be formed by the sharing of electrons between the atoms different elements.
For example:
In the molecule of ammonia (NH3) there are two different kind of atoms i.e, nitrogen and hydrogen. Ammonia consist of total four atoms. The one atom is nitrogen and others three atoms are of hydrogen.The nitrogen atom consist of five valance electrons, three electrons are used to form three covalent bond with hydrogen. While the one electron pairs is still present on nitrogen atom.The three hydrogen atoms are bonded with one nitrogen atom through single covalent bond for each atom.