The umber of neutrons present in an element having mass number 226 and atomic number 88 is– (1) 88 (2) 138 (3) 314 (4) 50

The umber of neutrons present in an element having mass number 226 and atomic number 88 is– (1) 88 (2) 138 (3) 314 (4) 50
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(2) 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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