GK
CHEMISTRY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Isotopes
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Atomic mass
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Atomic number
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None of the above
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Detailed explanation-1: -Atomic number is the number of protons present in the nucleus of an atom of an element. Example: The nucleus of hydrogen atom contains 1 proton and hence, the atomic number of hydrogen is 1. The nucleus of carbon atom has 6 protons and hence, the atomic number of carbon is 6.
Detailed explanation-2: -The number of protons in the nucleus of the atom is equal to the atomic number (Z). The number of electrons in a neutral atom is equal to the number of protons. The mass number of the atom (M) is equal to the sum of the number of protons and neutrons in the nucleus.
Detailed explanation-3: -The number of protons in an atom is called the ATOMIC NUMBER of the element. Each element therefore has a unique atomic number.