if there are 100 students and 300 are girls what is the fraction of girls
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The formula of an ionic compound can be deduced from the formulae of its ions. Remember that for the metal elements in groups 1, 2, and 3 the charge on the ion can be deduced by how many outer shell electrons there were in the neutral atom. Similarly, the non-metal elements in groups 6 (IUPAC group 16) and 7 (IUPAC group 17), the ionic charge can be deduced by working out how many electrons must be gained to fill the outer shell.
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1/3 of the students are girls
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