Q.

The umber of neutrons present in an element having mass number 226 and atomic number 88 is–

A. 88
B. 138
C. 314
D. 50
Answer» B. 138
Explanation: The mass number is a count of the number of particles in an atom's nucleus which is made up of protons and neutrons. In other words, Mass Number = Number of Protons + Number of Neutrons. The atomic number is the number of protons in an atom of an element, 226 = 88 + number of Neutrons. So, the number of neutrons= 226 - 88= 138.
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