Question

The mass number of a nucleus is

A. always less than its atomic number
B. the sum of the number of protons and neutrons present in the nucleus
C. always more than the atomic weight
D. a fraction

correct option and Explain...??​

Answer 1

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➡ Correct Option Is --B

➡the sum of the number of protons and neutrons present in the nucleus

➡$\huge\red{Explain:-}$

➡➡The number of protons in the nucleus of the atom is equal to the atomic number (Z)

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Answer 2

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Option (B) The sum of the number of protons and neutrons present in the nucleus.

Explanation

The mass number is commonly cited in distinguishing among the isotopes of an element, all of which have the same atomic number (number of protons) and are represented by the same literal symbol; for example, the two best known isotopes of uranium (those with mass numbers 235 and 238) are designated uranium-235 (symbolized 235U) and uranium-238 (238U).

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