Question

Explain with examples
(i) Atomic number
(ii) Mass number
(iii) Isotopes
(iv) Isobars.
Give any two uses of isotopes.​

Answer 1

Answer:

(i) Atomic number: The atomic number is the total number of protons present in the atom. For example, the atomic number of Mg is 12. It contains 12 protons and 12 electrons.

(ii) Mass number: It is the sum of the number of neutrons and the number of protons.

(iii) Isotopes are variants of a particular chemical element which differ in neutron number, and consequently in nucleon number. All isotopes of a given element have the same number of protons but different numbers of neutrons in each atom.

Answer 2

❥Question

❥Explain with examples

• (i) Atomic number
• (ii) Mass number
• (iii) Isotopes
• (iv) Isobars.

Give any two uses of isotopes.

❥Answer

(i) Atomic Number refers to the number of protons present in an atom. It is denoted by Z.

• Number of protons present in the nucleus of an atom.

(ii) Mass number is the sum of the number of protons and neutrons present in the nucleus of an atom. It is denoted by A.

(iii) Isotopes:- Same atomic number but different mass number.

Example -

$C - 12 , C - 14$

❥Any two uses of Isotopes :

• 1. An isotope of uranium is used as a fuel in nuclear reactors.

• 2.An isotope of cobalt is used in the treatment of cancer

(iv) Isobars:- Isobars are atoms of different elements having same mass number. These have equal number of nucleons but different number of protons, neutrons and electrons.

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