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Studentka2010 [4]
4 years ago
9

Which of the following explains why elements in column 17 (the halogens) are very reactive? A. Their atoms contain three energy

levels.. . B. Their atoms need only one electron to complete their outer energy level.. . C. Their atoms have large masses.. . D. Their atoms contain the same number of protons as electrons..
Chemistry
2 answers:
RUDIKE [14]4 years ago
6 0
I believe the correct response is B. Their atoms need one electron to complete their outer energy level.
KengaRu [80]4 years ago
6 0
The answer is B, as halogens will have a full octet after receiving another electron in their outer energy level.
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