Time left: 0:39:48 The concept of multiple bonds is used to explain the molecular formula of Select one C.CH d. BF PIECE Naturally occurring gallium (relative atomic mass 69.72) consists of two isotopes, gallium-69 and gallium 71. The percentage abundances of gallium-69 and gallium-71, in order, are Select one: a. 64% and 36% b. 76% and 24% C87% and 139 d. 98% and 2% numbers of and 50 respectively. The relative An element has two isotopes A and B with mass numbers of 52.0 and 53.0 respectively. The relative atomic mass is 52.3. The percentage abundance of the two isotopes is Select one: a A -20% B - 80% b A -25% B - 75% C. A-80% B - 20% d. A -70% B-30% e A- 50% B - 50%