Aneutral atom contains 12 neutrons and 11 electrons. the number of protons in this atom is
(1) 1 (3) 12
(2) 11 (4) 23

Because the atom is neutral, it has no charge. For this to happen, the number of positive and negative charges must be the same. Therefore, because there are 11 -1 charged electrons, there must also be 11 +1 charged protons
So the answer is (2)

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