What is a molecule and how is it formed?

Answer 1

1. A molecule is a group of at least two atoms chemically combined in definite

proportions.

For example, a water molecule (H2O) is always composed of two atoms of hydrogen chemically combined with one of oxygen. (a 2 hydrogen :1 oxygen proportion)

If you have a combination of three hydrogen atoms with one oxygen atom

(3 hydrogen:1 oxygen ) , the combination is notwater;this is what is meant by defininte proportions.

2. Molecules are held together by covalent bonds;i.e., the sharing of pairs of electrons holds the atoms together. Also, molecules are held together by columbic forces or forces of electrostatic attraction in case of ionic compounds.

Additional Note : * If different kinds of atoms combine to form a molecule, the

substance formed is called a compound.

An example of a compound is water.

* If atoms of the same kind combine to form a molecule, the substance is

called an element.

Example , oxygen (O2)

Answer 2

A molecule is a combination of two or more atoms. It forms by covalent (electron sharing) bonds that form when the atoms come together in mixture.
A molecule is the smallest particle of a substance that retains all the properties of the substance and is composed of two or more atoms. Molecules form when atoms form covalent bonds with one another.

Answer 3

A molecule is a group of atoms bonded together. Molecules are formed when atoms share electrons to achieve a more stable configuration, typically by forming covalent bonds where electrons are shared between atoms. This sharing of electrons allows atoms to achieve a full outer electron shell, making the molecule more stable than the individual atoms.