A molecule is the smallest particle of an element or a compound which can exist in a free state independently under normal conditions and exhibits all the properties of a substance (element or compound).

The smallest particle of matter which is capable of independent existence and which exhibits the properties of the matter is called the molecule of the matter. Example of molecules are O 2 , N 2 , H 2 and P 4 etc.

A molecule is the smallest particle of a substance (element or compound) which is capable of independent existence and shows all the properties of that substance. A molecule may be regarded as a group of two or more atoms that are chemically bonded together.

EASY

Earn 100

Which of the following is the smallest unit of a substance capable of independent existence?

50% studentsanswered this correctly

Important Questions on Atoms and Molecules

EASY

Science>Chemistry>Atoms and Molecules>Molecule

The mass number and the volume of a nucleus is

M

and

V

respectively. If the mass number is increased to

2 M

then the volume is changed to

HARD

Science>Chemistry>Atoms and Molecules>Molecule

In a Davisson-Germer experiment, Helium atoms were used in place of electrons. What should be the energy of Helium so that a strong peak of scattered He appears at an angle of

50 °,

as was the case with electrons having an energy of

54 eV ?

(Take mass of

He

atoms to be

7500

times the mass of electrons)

MEDIUM

Science>Chemistry>Atoms and Molecules>Molecule

Select the correct options from the following statements:

I. ${}_{6}^{12}C$ and ${}_{6}^{14}C$ are isobars of each other.

II. ${}_{6}^{12}C$ reacts with ${}_{8}^{16}O$ to form a product which contains ionic bonds.

III. ${}_{20}^{40}{Ca}$ and ${}_{18}^{40}{Ar}$ are isobars of each other.

IV. ${}_{20}^{40}{Ca}$ reacts with ${}_{8}^{16}O$ to form a compound whose aqueous solution is known as lime water.

MEDIUM

Science>Chemistry>Atoms and Molecules>Molecule

The graph of

\ln (\frac{R}{R_{0}})

versus

\ln A

(

R =

radius of a nucleus and

A =

mass number) is

EASY

Science>Chemistry>Atoms and Molecules>Molecule

Atomicity of oxygen in ozone molecule is

MEDIUM

Science>Chemistry>Atoms and Molecules>Molecule

Define the following terms.

Molecule

EASY

Science>Chemistry>Atoms and Molecules>Molecule

Define molecule.

EASY

Science>Chemistry>Atoms and Molecules>Molecule

State the meaning of the term atom with a suitable example.

MEDIUM

Science>Chemistry>Atoms and Molecules>Molecule

'Atoms of the same element or different elements combine to form a molecule'.
Give two examples each of
a] Atoms of the same element
b] Atoms of different elements combining to form a molecule.

EASY

Science>Chemistry>Atoms and Molecules>Molecule

Atoms form ____________.

EASY

Science>Chemistry>Atoms and Molecules>Molecule

The smallest unit of a pure substance, which can always exist independently and can retain all the physical and chemical properties of it, is called:

HARD

Science>Chemistry>Atoms and Molecules>Molecule

Define a molecule. How many molecules are present in
(a)