Question

Gallium has an atomic number of 31 and a mass number of 70. Which table shows the number of protons, neutrons, and electrons in a gallium ion with a +3 charge?(1 point)
Responses

Particle Number
protons 39
neutrons
31

electrons 39Particle Number protons 39 neutrons 31 electrons 39

Particle Number
protons 39
neutrons
31

electrons 36Particle Number protons 39 neutrons 31 electrons 36

Particle Number
protons 31
neutrons
39

electrons 28Particle Number protons 31 neutrons 39 electrons 28

Particle Number
protons 31
neutrons
39

electrons 31

Answer 1

To determine the number of protons, neutrons, and electrons in a gallium ion with a +3 charge, we start with the basic information about gallium:

1. The atomic number of gallium (Ga) is 31, which means it has **31 protons**.
2. The mass number is 70, which accounts for the total number of protons and neutrons. To find the number of neutrons, we can use the formula:

\[
\text{Neutrons} = \text{Mass number} - \text{Atomic number} = 70 - 31 = 39
\]

So, gallium has **39 neutrons**.

3. An ion with a +3 charge means it has lost 3 electrons. In a neutral gallium atom, the number of electrons is equal to the number of protons, which is 31. Therefore, for a gallium ion with a +3 charge:

\[
\text{Electrons} = \text{Protons} - 3 = 31 - 3 = 28
\]

Now we can summarize the counts:

- Protons: 31
- Neutrons: 39
- Electrons: 28

Based on this information, the correct response from the options provided is:

**Particle Number
protons 31
neutrons 39
electrons 28**