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Which procedure did early chemists use to determine which substances were elements?. A.They mixed several substances together and observed the results.. B.They broke down mixtures by chemical means.. C.They physically broke down the elements they discovered.. D.They observed the substances that made up individual atoms.. . . Why do elements in a group on the periodic table have similar chemical properties?. A.similar atomic masses. B.similar atomic numbers. C.same number of protons. D.same number of outermost electrons.

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taskmasters
"They broke down mixtures by chemical means" is the procedure among the procedures given that did early chemists use to determine which substances were elements. The correct option among all the options that are given in the question is the second option or option "B". I hope that the answer has helped you.
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Answer:

The correct option to the first question is B

The correct option to the second question is D

Explanation:

Early chemists understood of one of the properties of elements to be that elements cannot be broken down by ordinary chemical method. They came about this by observing chemical reactions. Hence, they broke down mixtures by chemical means is the answer since they subject most substances to chemical reaction in order to determine elements.

Elements in the same group have the same number of electrons on there outermost shell, this electrons are what usually take part in chemical reactions and hence determine the chemical properties of elements. Thus, elements having the same number of electrons on there outermost shell will exhibit similar chemical properties.