GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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always less than its atomic number
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always more than the atomic weight
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the sum of the number of protons and neutrons present in the nucleus
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none of these
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Detailed explanation-1: -The total number of protons and neutrons present in the nucleus of an atom.
Detailed explanation-2: -The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus. The number of neutrons is equal to the difference between the mass number of the atom (M) and the atomic number (Z).
Detailed explanation-3: -The total number of protons and neutrons in an atom is called its mass number (A).
Detailed explanation-4: -The mass number (symbol A, from the German word Atomgewicht [atomic weight]), also called atomic mass number or nucleon number, is the total number of protons and neutrons (together known as nucleons) in an atomic nucleus.
Detailed explanation-5: -The mass number tells us the number the sum of nucleons i.e number of protons and neutrons in the nucleus of an atom. The atomic number is the number of protons found in the nucleus of an atom. It is traditionally represented by the symbol Z.