Consider an atom of gold in which the nucleus contains 79 protons and 118 neutrons. what is its atomic number and atomic mass number? the atomic number is 79, and the atomic mass number is 197.the atomic number is 79, and the atomic mass number is 118.the atomic number is 118, and the atomic mass number is 197.the atomic number is 118, and the atomic mass number is 79.

The atomic number is 79 and the atomic mass is 197.

Explanation:

The atomic number (symbol Z) of a chemical element is the number of protons within its nucleus.

Gold (chemical symbol Au)  is a chemical element with  79 protons in its nucleus, therefore with atomic number 79.

The atomic mass is the  average mass of the atoms of an element (in atomic mass unit). The atomic mass is the weighted average of all the isotopes of a a particular element. For each isotope the atomic mass is approximately the mass of both protons and neutrons since electrons make minor contributions.

The atomic mass of Gold (Au) is 196.9665  but, it can be rounded to 197.

The atomic number can be defined as the number of protons present in an element.

The atomic mass number is the averaged sum of the mass of the protons and neutrons of all the available isotopes of the element.

The given gold atom has 79 protons and 118 neutrons.

Thus, the atomic number will be the total number of protons. The atomic number of the gold atom will be 79.

The atomic mass number = protons + neutrons

Atomic mass number = 79 + 118

Atomic mass number = 197

Thus, the atomic mass number of the gold atom is 197.

The atomic number of the gold atom is 79, and the atomic mass number is 197.

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