A substance that is made of atoms of more than one type bound together is called a(n) ____________________ .
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Z equals 4. See attached
It's a summation (sigma) notation.
This expression means the sum of all the terms , where <em>i</em> takes the values from 1 to <em>n</em>.
So <em>i</em> is the index (like a counter) and <em>n</em> is the last value.
In this case: