I need help...

I love those types of answers!
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Quote:
Well Mahonri's answer is much better than the one I'm seriously considering filling in the blank with, which, by the way is not conducive to a family friendly forum..

Hmm... Seems to me I got suspended once many years ago for writing that kind of answer.
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Well Mahonri's answer is much better than the one I'm seriously considering filling in the blank with, which, by the way is not conducive to a family friendly forum..

I guessed 3, but Debi beat me to the answer... and for all I know Mahonri nailed it...
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The isotopic numbers (top) have to be the same on both sides, so if you have Lithium-6 and 1 neutron, then the other side has to equal 7 as well. You have Helium-4 plus an electron, so you need an isotope of three.

The bottom number (the number of protons present) must also be the same. You have three on the left, so you must have 3 on the right. Remember that the electron produces a negative number. So, if you need a total of three and you have -1 and 2, you need a 2 to balance it, right?

That bottom number is an atomic number. So, whatever the number is represents the element on the periodic chart.
So...you get

(7-4) 3

X = He

(3-(-1)-2) 2

It has to be Helium, since 2 is the atomic number (the number of protons) for Helium.

I think that is right anyway.
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