How does the energy of an electron change when the electron moves further away from the nucleus?

What’s the scientific notation for the number 6,840,000,000

What is the most important factor in determining climates.

The solid xy decomposes into gaseous x and y: xy(s) m x(g) + y(g) kp = 4.1 (at 0 °c) if the reaction is carried out in a 22.4 l container, which initial amounts of x and y will result in the formation of solid xy?