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I am an element in period 4 with 7 valence electrons.​

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User Dreaddan
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2 Answers

6 votes

Answer:

The elements in this family are fluorine, chlorine, bromine, iodine, and astatine. Halogens have 7 valence electrons, which explains why they are the most active non-metals.

Step-by-step explanation:

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User Peter Westerlund
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1 vote

Answer:

Selenium

Step-by-step explanation:

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User Pnj
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