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group-17 elements are called halogens. They are non-metals.They have 7 valence electrons.

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What group of elements are most active?

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Which elements are the most active in a group?

As a general rule, these are the elements toward the top of the group in the periodic table.


What are elements in group 17 called?

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Not counting the Noble Gases in the last group of the Periodic Table, the most active elements are located at the lower left and upper right. Assuming you are talking about pure, elemental gases, that would make Fluorine the most active gas. Not counting the Noble Gases in the last group of the Periodic Table, the most active elements are located at the lower left and upper right. Assuming you are talking about pure, elemental gases, that would make Fluorine the most active gas.


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