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kekeman:
Using the periodic table, determine which of the following elements has the MOST similar properties as Chlorine (Cl). * 3 points Magnesium (Mg), because they are both in the third period. Helium (He), because they are both non-metals. Calcium (Ca), because they both have three energy levels. Bromine (Br), because they are both halogen nonmetals.
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