A geologist claims to have found a sealed chamber below the Earth's surface. The chamber reportedly contains air that is over 3.6 billion years old. How is
the air in the chamber different from the air you breathe today? How is it
similar?

13. a covalent bond between two atoms is likely to be polar if: a. one of the atoms is much more electronegative than the other. b. the two atoms are equally electronegative. c. the two atoms are of the same element. d. the bond is part of a tetrahedrally shaped molecule. e. one atom is an anion.