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Question

# An atom has mass number 23 and atomic number 11. How many protons, electrons and neutrons are present in the atom?

A
11,12,13
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B
11,11,12
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C
11,11,13
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D
11,14,15
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Solution

## The correct option is B 11,11,12(B) 11,11,12Given - Mass number of atom = 23 Atomic number of atom = 11As, no. of electrons in an atom is equal to an atomic number of the element.So, number of electrons = 11Secondly , number of protons are equal to number of electrons.so, number of protons = 11And number of neutrons = mass number - atomic number = 23−11 = 12so, number of neutrons = 12So , the atom contains 11 protons, 11 electrons, 12 neutrons.

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