The mass number of an atom is determined by the number of protons and neutrons. Calculate the mass number of a Sodium (Na) atom if the number of neutrons in it are 12.

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Solution

The correct option is B
23

Mass number of the atom is the sum of protons and neutrons. Number of protons can be determined with the help of atomic number. Atomic number of Sodium is 11. It has 11 protons. So, mass number of sodium = 11 + 12 = 23.

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Similar questions

If sodium has atomic number 11 and mass number of 23, then the number of protons, neutrons, and electrons in an uncharged atom is :

Atomic number	Mass number	Number of neutrons	Number of protons	Number of electrons	Name of the Atomic species
9	-	10	-	-	-

Atomic number	Mass number	Number of neutrons	Number of protons	Number of electrons	Name of the Atomic species
16	32	-	-	-	Sulphur

Atomic number	Mass number	Number of neutrons	Number of protons	Number of electrons	Name of the Atomic species
16	32	-	-	-	Sulphur

Atomic number	Mass number	Number of neutrons	Number of protons	Number of electrons	Name of the Atomic species
-	2	-	1	-	-

Atomic number	Mass number	Number of neutrons	Number of protons	Number of electrons	Name of the Atomic species
-	1	0	1	1	-

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