The atom described in the question is an atom of a group 1 element. Hence an atom having 11 protons , 11 neutrons, and 11 electrons will be in the same group with this atom. The correct answer is option B: 11 protons m, 11 neutrons, and 11 electrons.
Atoms of elements in group 1 have electronic configuration ending in ns1.
If we look at the atom described in the question, its electronic configuration is 1s2 2s1.
The atom having 11 electrons has electronic configuration 1s2 2s2 2p6 3s1. This atom is also a member of group 1. The atom has 11 protons , 11 neutrons, and 11 electrons.
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