Question

An isotope of uranium is ₉₂Y²³⁸, i.e., it has mass number 235 and atomic number 92.

Find the number of protons and neutrons in its nucleus.

An isotope of uranium has a mass number of 235 and an atomic number of 92. How many protons and neutrons are there in the nucleus of this isotope?

Answer 1

Mass Number (A) = 235

Atomic Number (Z) = 92

The number of protons is equal to the atomic number (Z).

Number of protons = Z = 92

The number of neutrons (N) is found by subtracting the atomic number from the mass number (A − Z).

∴ Number of neutrons = A − Z

= 235 − 92

= 143