High School

Identify the correct statement for an atom of the element Bi-209.

A. The atom contains 83 protons, 126 neutrons, and 83 electrons.
B. The atom contains 209 protons, 83 neutrons, and 209 electrons.
C. The atom contains 126 protons, 209 neutrons, and 126 electrons.
D. None of these answers are correct.

Answer :

Final answer:

The correct statement for an atom of the element Bi-209 is that it contains 83 protons, 126 neutrons, and 83 electrons. The atomic number (protons) and atomic mass define the composition of the atom.

Explanation:

For an atom of the element Bi-209, the correct statement is that the atom contains 83 protons, 126 neutrons and 83 electrons. The atomic number of Bismuth (Bi) is 83 which represents the number of protons. In stable atoms, the number of protons and electrons are equal, hence 83 electrons. The difference between the atomic mass (209) and the atomic number (83) gives the number of neutrons, thus 126 neutrons.

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