Chlorine has the greatest number of valence electrons available for bonding among selenium, boron, calcium, and chlorine.

Quick Scoop

  • Selenium (Se) is in group 16 and has 6 valence electrons.
  • Boron (B) is in group 13 and has 3 valence electrons.
  • Calcium (Ca) is in group 2 and has 2 valence electrons.
  • Chlorine (Cl) is in group 17 and has 7 valence electrons, which is the highest of the four.

Because chlorine has 7 electrons in its outer shell, it has the greatest number of valence electrons available for bonding in this list.