Posted by Danny on Thursday, July 24, 2008 at 5:41pm.
The atomic number is 63. Look up the element for 63. It's on the periodic table.
The number of protons + the number of neutrons is the mass number. Since an atom is neutral, 63+ charges(protons) but only 60 negative charges (electrons), that means the ion has a charge of +3 (63+ - 60- = 3+).
Element 63 is Europium, symbol Eu.
On the left of the symbol write 63 has a subscript. On the left of the symbol write 151 as a superscript. (That's 63 protons + 88 neutrons = 151 total = mass number). On the right of the symbol, write as a superscript 3+ to show the charge. It should look approximately like this:
15163Eu3+
Now you should be able to do the second one. I shall be happy to check your work.
Note in the above that the 151 and the 63 should be directly above and below each other.
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