Question 3
The number of electrons in an element X is 15 and the number of neutrons is 16. Which of the following is the correct representation of the element?
(a) 3115X
(b) 3116X
(c) 1615X
(d) 1516X
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Solution
The answer is (a).
Given that, number of electrons in element X = 15 number of neutrons = 16
Atomic number = number of protons = number of electrons in neutral atom = 15.
Mass number = number of protons + number of neutrons = 15+16=31