Using the periodic table as a reference, which pair of elements are nonmetals? A. oxygen and sulfur

B. cobalt and zinc

C. mercury and lead

D. sodium and iodine

Why is the bond angle in a water molecule less than the bond angle of methane? a. the central oxygen atom in water has two lone pairs of electrons, whereas the central carbon atom in methane has no lone pairs. b. the central hydrogen atom in water has one lone pair of electrons, whereas the central carbon atom in methane has two lone pairs. c. the central oxygen atom in water has four lone pairs of electrons, whereas the central carbon atom in methane has only one lone pair. d. the central oxygen atom exerts more repulsive force on surrounding atoms than the central carbon atom in methane does. reset next

Which of the following units is not an official si unit? mole liter kilogram ampere

An atom of which element reacts with an atom of hydrogen to form a bond with the greatest degree of polarity ?