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There are many different ways to divide the real number system into sub-groups. Perhaps the most obvious division is, positive numbers and negative numbers.

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Q: What are two sub-groups of the real number system?
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Is There are two different ways to number the groups of the periodic table?

Yes, there are two main ways to number the groups on the periodic table: the IUPAC (International Union of Pure and Applied Chemistry) numbering system, which numbers groups from 1 to 18, and the older, simpler system which numbers groups from 1 to 8 (with some groups further divided into subgroups A and B).


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