# How do you find the charge of an atom?

Calculate the electrostatic force between a proton and a gold nucleus Au with a distance 7.5x10-13m
19797Au

The Electrostatic force is (Q1Q2)/4∏ε0d2

Two things I want to know, the charge of the gold and how to find the charge of Atoms!
All I need to know is the charge, I can do the rest!

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Au has 97 protons (and electrons) therefore the charge on the nucleus is +97 x electron charge. The charge on the proton is +1 electron charge
Electron charge is 1.6 x 10 ^-19 C

Au has 97 protons (and electrons) therefore the charge on the nucleus is +97 x electron charge. The charge on the proton is +1 electron charge
Electron charge is 1.6 x 10 ^-19 C
Thanks!

epenguin
Homework Helper
Gold Member
That is what it is but your question was how do you find out? What will you do if the next question is about lead or other element nucleus?

You didn't know that is the atomic number which you will find in every periodic table, not to be confused with atomic mass which you will find in the same table?

Redbelly98
Staff Emeritus
Homework Helper
Au has 97 protons
No it does not.

Let's please let the OP find the correct number.

sorry Redbelly98 and alewisGB!!!! __ protons not 97.
Very sloppy of me, easy to check with periodic table. I suppose whether it is gold or not is irrelevant, OP should find out what to look for.

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Redbelly98
Staff Emeritus