Explain correlation and how it is used to relative age date layers of rock

Atomic nuclei of almost all elements consist of

Because atoms of elements in the same group of thbecause atoms of elements in the same group of the periodic table have the same number of neutrons, they have similar properties. select the best answer from the choices provided t fe periodic table have the same number of neutrons, they have similar properties. select the best answer from the choices provided t f

2) why do satelites not fall while revolving around the earth?