Q37 of 149 Page 211

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

An atom can have only electron and proton but o neutron is the correct statement about the atoms of an element.

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35

What is the relation between the valency of an element and the number of valence electrons in its atoms? Explain with examples.

 36

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:

 38

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

 39

The radioactive isotope used in the treatment of cancer is: