Gallium has two naturally occurring isotopes. Mass of gallium-69 is 68.9256 amu and the mass of gallium 71 is 70.0247 amu. If the average atomic mass of gallium is 69.72 amu, please calculate the relative abundance of the isotopes.

Which statement is a reason to support population regulation? a) it is unethical for us to control birth control rates b) humans have the freedom to produce as many children as desired c) the gap between the rich and poor has been narrowing since 1960 d) billions more people on the earth will intensify many environmental and social problems

Which of the following is not true about the atomic model of substances?

The movement of tectonic plates and in two locations is described below: location a: tectonic played push together location b: tectonic plates push apart