Which of the following is equal to them as number of a nucleus?

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Number of electrons it contains

Number of protons it contains

Number of neutrons it contains

Number of nucleons it contains

answer is D.

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Detailed Solution

Concept: An atom consists of a positively charged nucleus surrounded by one or more negatively charged particles called electrons.In atom,In atom, number of protons found in the nucleus equals the number of electrons that surround it, giving the atom a neutral charge
When two atoms are close enough to combine chemically and form chemical bonds with one another,outer electrons surrounded by atom, called valence electrons
The nucleus of an atom is composed of protons and neutrons; it is therefore positively charged.
The number of protons within the nucleus of a given atom is equal to the atomic number of the corresponding element, which can be found on the periodic table.
The number of neutrons within the nucleus of a given atom can be found by subtracting the atomic number from the atomic mass. The mass number is the sum of protons and neutrons.
Atomic Mass number = Number of protons + Number of neutrons
Together, the protons and neutrons are termed as nucleons
Therefore,Atomic mass number = Number of nucleons
Therefore, the mass number of a nucleus of an atom is equal to the number of nucleons (i.e., sum of the number of neutrons and protons) present in the nucleus of that atom.
Hence, option 4 is correct.

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