Which of the following atoms contains seven valence electrons?
carbon
iodine
hydrogen
helium

Option (b) is the correct answer.

Explanation:

Iodine is a group 7 element and its atomic number is 53. Electronic configuration of iodine is .

So, the outermost shell of iodine contains 7 electrons, that is, in 5s and 5p.

Whereas carbon is a group 14 element and its atomic number is 6. Electronic configuration of carbon is . A carbon atom has four valence electrons.

Atomic number of hydrogen atom is 1 and there is only one valence electron.

Atomic number of helium is 2 and its electronic configuration is .

Thus, we can conclude that out of the given options iodine atoms contain seven valence electrons.

c. electrical charges of ionic bonds.