The isotope symbol for an ion that has 11 protons, 12 neutrons, and 10 electrons is:

Question

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The isotope symbol for an ion includes the atomic number (number of protons) as a subscript on the left, the mass number (number of protons plus neutrons) as a superscript on the left, and the charge (number of electrons lost or gained) as a superscript on the right. In this case, the atomic number is 11, denoted by the subscript 11. The mass number is 11 + 12 = 23, denoted by the superscript 23. The ion has 10 electrons, which means it has a charge of +1 (since it has one fewer electron than a neutral atom). The charge is denoted by a superscript with a plus sign, so the isotope symbol is ₁¹¹B⁺. Choice C has this correct isotope symbol.

The Isotope Symbol for an Ion That Has 11 Protons