1. Rubidium has 2 isotopes in nature, and the average atomic mass is 85.557 amu. Rb-85 has a relative abundance of 72.15%.
What is the relative abundance of the other isotope, Rb-87?
PLEASE HELP

Newton's law Third law states that forces exist in equal magnitude and for every action force there is an equal and opposite reaction force.

Explanation:

Sir Issac Newton successfully derived three laws stating the mechanism of motion of any object. One among the three is the Newton's third law of motion. According to this law, the forces acting on any object will be equal or balanced force with respect to the force of the object itself.

2. Also this law confirmed that the force generated due to this law will be equal in magnitude and opposite in direction with respect to the other force acting on the same object. So every force acting on an object will be having another perpendicular force acting on the same object in opposite direction. This is termed as every action will have an equal and opposite reaction force.

So Newton's law Third law states that forces exist in equal magnitude and for every action force there is an equal and opposite reaction force.