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.

in cartography, a contour line (often just called a "contour") joins points of equal elevation (height) above a given level, such as mean sea level. a contour map is a map illustrated with contour lines, for example a topographic map, which thus shows valleys and hills, and the steepness or gentleness of slopes.

explanation: