Can someone help me through this?
What is the charge on the subatomic particles represented in Figure 4-3? Assuming all the particles in the nucleus are visible, what are the atomic and mass numbers of the atom shown?

Question

Can someone help me through this?
What is the charge on the subatomic particles represented in Figure 4-3? Assuming all the particles in the nucleus are visible, what are the atomic and mass numbers of the atom shown?

cheyennecoffelt · Answer

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anonymous · Answer

Atomic number is the number of protons, and you count 8 protons, so it equals 8. 
Mass number is the sum of the protons and neutrons. 8 protons + 9 neutrons = 17.

cheyennecoffelt · Answer

Thank you!

cheyennecoffelt · Answer

Would it have a negative charge then?

anonymous · Answer

It would actually be an isotope. In this case it would be O-17. (I got oxygen while looking at the atomic number) The number of protons don't change (there are rare cases though) but the neutrons can. When the number of neutrons isn't the same as the protons, it's an isotope.
A negative charge would be gaining an electron. Since the picture doesn't provide information about the electrons, you would assume it's equal to the number of protons. Therefore, there is no charge.

cheyennecoffelt · Answer

okay, thanks! you've helped me a lot :)