Question

Give reasons: a. The atoms exist in combination with atoms of same element or others elements.

Answer 1

Answer:

Molecules of elements: When two of more atoms of same element combine to form a molecule these are called molecules of element. Example: Hydrogen molecule (H2): Molecule of hydrogen is formed by the combination of two hydrogen atoms.

Answer 2

Answer:to attain stable electronic configuration of nearest noble gas

Explanation:

for an atom to attain stable electronic  configuration it should have either 2 electrons or eight electrons in the outermost(valence) shell