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

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11, 11, 12

11, 11, 13

11, 12, 13

11, 14, 15

answer is B.

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Detailed Solution

An atom has a mass number of 23 and an atomic number of 11. The number of protons, neutrons and electrons in the atom are 11, 11, and 12, respectively.
The number of neutrons is calculated using the formula

Number of neutrons = Atomic mass - Atomic number

For a given atom, the number of neutrons is

\Rightarrow Number of neutrons = 23 - 11

\Rightarrow Number of neutrons = 12

For an atom, the number of protons and electrons are the same as the atomic mass of that atom. Therefore, the number of protons and electrons for the given atom is 11.

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