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# The number of neutrons in the Sodium atom is A) 10B) 11C) 13D) 12

Last updated date: 29th May 2024
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Hint: Neutrons and protons together make up the nucleus of an atom.
The number of protons is equal to the atomic number (Z) of the element.
The sum of the number of protons and the number of neutrons is equal to the mass number (A) of the element.

Neutrons and protons together reside in the nucleus of an atom.
The Sodium atom has an atomic number of 11. By definition,
$\text{Number of protons = Atomic number of element }\left( \text{Z} \right)$
Thus, the number of protons in the nucleus of sodium is 11. --(1)
Also, Sodium has a mass number of 23. By definition,
$\text{Number of protons + Number of neutrons = Mass number of an element }\left( \text{A} \right)$
$\therefore \text{Number of protons + Number of neutrons = 23}$ --(2)
Now, using (1) in (2),
$11+\text{ Number of neutrons = 23}$
$\therefore \text{Number of neutrons = 23-11 = 12}$
Therefore, there are 12 neutrons in the sodium atom.
Hence, the correct option is D) 12.