Q38 of 149 Page 211

There are two species represented as 35Cl and 37Cl. Which of the following statement is correct regarding these species?

They have the same number of protons is correct regarding this species.

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The mass number of two atoms X and Y is the same (40 each) but their atomic numbers are different (being 20 and 18 respectively). X and Y are examples of:

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Which of the following statement is correct about the atom of and element?

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Elements having valency ‘one’ are: