Which of the following group 7a elements is the most reactive?
cl (chlorine)
i (iodine)
f (fluorine)
br (bromine)
which of the following gases emit colors when an electric current is applied?
hydrogen and helium
argon and krypton
fluorine and chlorine
oxygen and nitrogen
Answers: 3
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Which of the following group 7a elements is the most reactive?
cl (chlorine)
i (iodine...
cl (chlorine)
i (iodine...
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