Two gasses in the air that cause rusting

Which statement correctly describes metallic bonds? a. they form when certain atoms lose electrons and other atoms gain electrons. b. they involve an attraction between anions and cations. they always involvpoth a metal and a nonmetal. d. they can only form between atoms of the same element. e. they form because electrons can move freely between atoms.

Enzymes affect the reactions in living cells by changing the

Consider the four elements above. which one of these elements will combine with oxygen in a 1: 1 ratio?