High School

The atomic number of gold is 79. If the mass number of a gold atom is 197 amu, which table below shows accurate information?

| Number of Particles Inside Nucleus | Number of Particles Outside Nucleus |
|-------------------------------------|--------------------------------------|
| A. 79 | 197 |
| B. 79 | 118 |
| C. 197 | 118 |
| D. 197 | 79 |

Answer :

Final answer:

The correct choice is C, with 197 particles inside the nucleus and 118 particles outside the nucleus.

Explanation:

The correct choice is C. The number of particles inside the nucleus is equal to the atomic number, which for gold is 79. The mass number represents the total number of particles, which is the sum of protons and neutrons. Therefore, the number of particles outside the nucleus is the mass number minus the atomic number, which is 118 for gold.

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