Easy physics question (about electricity)

[MajesticMoose]

I've got my physics final tomorrow (last test ever in high school) and i can't seem to find my notes on this question. I'm sure its easy but i just don't remember how to do it. well, here it is:

What is the net charge of all electrons in a uranium atom(atomic number 92)?


thanks,
m00se

 

[Joony]

waht?

 

[MajesticMoose]

nef?

 

[Soybomb]

He we go with facilitated learning
How many electrons are in outermost shell?

 

[MajesticMoose]

i don't have the slightest clue. I don't think i've studied electrons that closely since some time last year.

m00se

 

[nirgis]

-92
unless you mean in coulombs, in that case its

92* -1.6*10^ -19 C

This is if it is neutral. If it is in a compund its different.

 

[MajesticMoose]

i don't think its that simple nirgis. What unit is that? It isn't coulombs which i think i need.

 

[MajesticMoose]

ok, i figured it was something simple like that. I really hate electricity, which doesn't make this any easier. Thanks.

m00se

 

[nirgis]

I wouldn't know this if I hadn't taken chemistry.

Me+ electrophysics= bad

 

[Adrian1]

Uhhh hmm i dont get it

 

[yakko]

Did you get the uranium from Taco Bell?

 

[RossGr]

I think nirgis has it right. The Atomic number, 92, is the number of protons. If it is a nutral atom (not ionized) then the number of electrons equals the number of protons so 92 * the electron charge, 1.6*10^-19 Coulombs, is the correct answer.