Substances having same number of electrons but different mass is known as:

isotopes

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isobars

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isotones

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allotropes

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Solution

The correct option is A isotopes
Isotopes are atoms of same element with same number of protons and electrons but different number of neutrons.
They have same atomic number but different mass number.
For example, chlorine has two isotopes with mass numbers 35 and 37 respectively. They have atomic number of 17 each. Both have 17 protons and 17 electrons each. One isotope has 18 neutrons and other isotope has 20 neutrons.

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Similar questions

Question 07

Two atoms are said to be isobars if ?

(a) They have same atomic number but different mass number

(b) They have same number of electrons but different number of neutrons

(d) Sum of the number of protons and neutrons is same but the number of protons is different

Atoms of a substance which have the same atomic number but different mass numbers are

Atoms having same atomic number and different mass numbers are known as __.

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