why is the electron in a bohr hydrogen atom bounf less tightly wehnits electron is in energylevel 3 than when it is in energy level 1

Are oil and water a mixture or solution

The point along a planet's orbit where it is closest to the sun is called the

What volume of 0.500 mol/l hydrochloric acid, hci (aq) is required to react completely with 1.00 g of aluminum hydroxide, ai(oh)3 (s)?