JEE Main Chemistry question

Chemistry Structure of Atom JEE Main

The number of electrons and neutrons of an element are 18 and 20 respectively. Its mass number is

(A)2
(B)17
(C)37
(D)38Correct

Answer: (D)

Solution

For a neutral atom, the number of protons equals the number of electrons, so . Mass number protons neutrons .

Question ID VK-132150