Question 2/5 Rubidium is a soft, silvory. white metal that has two common isotopes, Rb-85 and Rb-87. If the abundance of Rb-85 is 80.2% and the abundance of Rb-87 is 19.8%, what is the average atomic mass of rubidium?
A. 85.396 amu
B. 86.132 amu
C. 85.590 amu
D. 86.245 amu

Chemical kinetics what was the rate of reaction in trial 3? choose the closest answer.

Select the correct answer from each drop-down menu.describe what happens to a carbon-11 atom when it undergoes positron emission.the decay of a carbon-11 atom _1_, and this causes it to emit _2_.options for 1: > changes a neutron into a proton> changes a proton into a neutron> is hit with a neutron> reconfigures its protons and neutronsoptions for 2: > a negatively charged electron-sized particle> a positively charged election-sized particle> two atoms and several neutrons> two neutrons and two protons

The reactions of photosynthesis occur in the of plant cell? a.mitochondria. b. lysosomes. c. chloroplasts. d. chlorophyll