If Atom 'A' has 18 protons and 21 neutrons and Atom 'B' has 19 protons and 21 neutrons, are these isotopes of the same element?

There is not enough information to determine this.

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No, because they have different numbers of protons.

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No, because they have the same number of neutrons.

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Yes, because they have different numbers of protons.

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Yes, because they have the same number of neutrons.

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Solution

The correct option is D No, because they have different numbers of protons.
Isotopes of the same element must have same number of protons but different number of neutrons.
As atoms A and B have different number of protons, thus they are not isotopes of each element.

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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

_{92}^{235} P

_{92}^{238} P

Isotopes have same number of protons but different number of neutrons.

Deuterium and tritium have the same number of protons and a different number of neutrons in each atom.

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