Homework Help: US History

Posted by mysterychicken on Friday, October 22, 2010 at 3:52pm.

41. A neutron atom of potassium has an atomic number of 19 and an atomic mass number of 39. Find its number of protons, neutrons, and electrons.

This is what I got-
Protons: 19
Neutrons: 20
Electrons: ?

Thanks
-MC

Chemistry - mysterychicken, Friday, October 22, 2010 at 3:57pm
**Not US History, haha

-MC
electrons - bobpursley, Friday, October 22, 2010 at 4:18pm
The electrons must be the same as the protons, or, Lord help us, each atom would be repulsively charged.
Chemistry - mysterychicken, Friday, October 22, 2010 at 4:21pm
So..19, right?

Thanks!
-MC
US History - bobpursley, Friday, October 22, 2010 at 4:55pm
yes, 19

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