Question

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

Answer 1

Ar40,19K40 are isobars having the same atomic mass but different atomic numbers. The two uses of isotopes are:

(i) As nuclear fuel: An isotope of uranium.

(U–235) is used as a nuclear fuel.

(ii) An isotope of cobalt is used in the

treatment of cancer.

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Answer 2

1. Atomic number is the number of protons present in the nucleus.

2.Mass number is addition of protons and neutrons in the nucleus.

3.Isotope are the elements having same atomic number and different mass number.

4. Isobars are the elements having different atomic mass and same mass number.

The two uses of isotopes are:

1. Some of the isotopes are used in solving chemical and medical mysteries.

2. Isotope of uranium is used as a fuel in nuclear reactors.