Posted by Blaze on Monday, May 2, 2011 at 9:18am.
The lower numbers must add to the same on both sides. The upper numbers must add to the same on both sides.
On the bottom. You have 92 + 0 on the left. There must be 92 on the right. We have 52 + 0 showing; the remainder must be the lower number for X. Look on the periodic table to find that element.
Top numbers are done the same way.
235+1 on the left = 236.
On the right, 236 - 137 -2 = top number for X.
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