Question

question 7
1 pts
all atoms of a given element have the same
number of neutrons
number of protons
mass
number of electrons and neutrons
density

question 8
1 pts
an atom of the most common isotope of gold, ¹⁹⁷au, has
neutrons, and electrons. protons,
79, 197, 197
197, 79, 118
118, 79, 39
79, 118, 118
79, 118, 79

Explanation:

For Question 7: The atomic number, which is the number of protons, defines an element. So all atoms of a given element have the same number of protons.
For Question 8: Gold (Au) has an atomic number of 79, so the number of protons is 79. For the isotope \(^{197}\text{Au}\), the mass - number is 197. The number of neutrons = mass - number - number of protons = 197 - 79=118. In a neutral atom, the number of electrons is equal to the number of protons, so there are 79 electrons.

Answer:

Question 7: number of protons
Question 8: 118, 79, 79