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They are all halogens, which are elements with seven electrons in their outer shells. They are all very energetically reactive. (Fluorine is so reactive it eats glass!) They are all very poisonous. They form acids when reacted with hydrogen, and salts when reacted with alkali metals.

Fluorine and chlorine are both gases at room temperature and bromine is a liquid. The other non-radioactive halogen, iodine, is a solid at room temperature. No one knows what a sample of astatine looks like because one big enough to see would burn up in an instant.

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7y ago
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7y ago

Their outermost (valency) shells contain one electron fewer than a full shell. As a result they readily form very reactive negative ions.

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Q: What are the similar characteristics between chlorine fluorine and bromine?
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