November 29, 2015

Homework Help: Chemistry

Posted by SC on Tuesday, April 6, 2010 at 7:28pm.

I have to write a bunch of atomic symbol for these isotopes and I don't understand how to I do it.

(a) atomic number=53, number of neutrons=79

I looked at the periodic table for 53 so the element is Iodine. So They gave the atomic number and I have the element, I need the mass #...

(b) number of protons = 29, mass number = 65

Would the element be Cu (Copper)?

(c) number of protons = 27, number of neutrons =31

element is Co (cobalt) ?
mass number= I don't know how to get that.

Please help me, thank you!

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