Question

3. Which of the following Group 7A elements is the most reactive? (1 point)Cl (chlorine)
I (iodine)
F (fluorine)
Br (bromine)

4. Which of the following gases emit colors when an electric current is applied? (1 point)hydrogen and helium
argon and krypton
fluorine and chlorine
oxygen and nitrogen

Answer 1

3. is fluorine

Answer 2

4 is hydrogen and helium

Answer 3

4 is actually argon and krypton which is 2 of the noble gases hydrogen is not an not a noble gas so it does not react to electricity by glowing.