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Sodium is not a radical, it is an element. Chemists use the term radical to refer to small groups of atoms, such as the nitrate or phosphate or ammonium radicals, which tend to remain together as a group even when undergoing chemical reactions. A single atom, such as a sodium atom, is not a radical, it is just an element.
Grouping symbols? parenthesis (), brackets [], the fraction line itself if written horizontally (not at a slant), any radical (square or cube root etc.)
7 groups, with 3 in each3 groups, with 7 in each21 groups, with 1 in each1 group, with 21 in each
2 groups of 16, 4 groups of 8, 8 groups of 4, 16 groups of 2. Not really divided or in groups, but there could be 1 group of 32 or everyone by themselves.
24/4 = 6 groups