Posted by Shay on Wednesday, September 26, 2012 at 10:23am.
number preceding symbol = atomic number(a subscript)
number after symbol = mass number(a superscript)
In nuclear equations the subscripts add up and the superscripts add up.
98Cf249 + 8O18 ==> nXm + on1 + on1 + on1 + on1.
So your job is to determine n, X, and m.
Remember the numbers must add up on both sides to the same thing.
For preceding number (the subscripts).
98 + 8 = n + 0 + 0 + 0 + 0 so n = 106
For number after the symbol (superscripts)
249 + 18 = m + 1 +1 +1 +1
m = 249 + 18 - 4 = 263
Now look on the periodic table and identify element X, element # 106. That's Sg. So the equation, in full, is
98Cf249 + 8O18 ==> 106Sg263 + 4 on1.
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