Covalent bonds usually occur between atoms that have high molecular weights and large atomic radii?

29.1-12=17.1the answer is this one

Ans. : frostbite is when exposure to cold temperatures causes freezing to the skin or other tissues. it most commonly affects the hands, feet, and face. the longer areas are exposed to cold, typically the worse the frostbite. the water temperature used for rewarming a frostbitten part should be : (102 -105) f degrees.