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Consider an atom of gold in which the nucleus contains 79 protons and 118 neutrons. What is its atomic number and atomic weight?

A. The atomic number is 79, and the atomic weight is 197.
B. The atomic number is 79, and the atomic weight is 118.
C. The atomic number is 118, and the atomic weight is 79.
D. The atomic number is 118, and the atomic weight is 197.

Answer :

Final answer:

The atomic number of the gold atom is 79 and its atomic weight is 197.

This is option A

Explanation:

The atomic number of an atom represents the number of protons in its nucleus. In this case, the atom of gold has 79 protons, so its atomic number is 79.

The atomic weight of an atom is the total number of protons and neutrons in its nucleus. Adding the 79 protons and 118 neutrons, we get an atomic weight of 197.

Therefore, the correct answer is A. The atomic number is 79, and the atomic weight is 197.

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