Question : An atom of an element has an atomic number of 17 and a mass of 36. The number of neutrons in its nucleus is
Option 1: 17
Option 2: 19
Option 3: 36
Option 4: 53
Correct Answer: 19
Solution : The correct answer is 19 .
The atomic number of an element is equal to the number of protons in its nucleus. In this case, the atomic number is 17, therefore there are 17 protons in the nucleus. The mass number of an atom is the sum of its protons and neutrons. The mass number is given as 36. To find the number of neutrons, subtract the number of protons (atomic number) from the mass number: No. of neutrons = mass no. - atomic no. = 36 - 17 = 19.
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