Periodic Table Question?

Question

Uranium-235

How many neutrons, protons, and electrons are in the U2+ ion formed from this isotope.

I have no idea how to figure this out, any help is appreciated.

Answer 1

K this is what you should do:

The Uranium-235 tells you that the atom has an atomic mass of 235 meaning the protons+neutrons=235.  

So look on the periodic table to find the atomic number of Uranium (its the top number, 92)  This is the # of protons.

Now, take 235-92 to get 143 neutrons.  And since Electrons are the same as protons, they should be 92 also.  BUTTTT, its a U +2 charge meaning there are 2 more positive particles(protons) than there should be.  This means there are only 90 electrons instead of 92.

Protons = 92

Neutrons = 235-92 = 143

Electrons = 92 - 2 = 90 because of the +2 charge

Hope this helps you with all the elements :P

Answer 2

protons = 92

neutrons = 235-92=143

electrons = 92 - 2 = 90