What causes the change within every twenty-four hours from day to night on Earth?

How far is the region from the equator or control climate

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

What are the first two quantum numbers for the electrons located in subshell 4d? what are the first three quantum numbers for the electrons located in subshell 2s? how many electrons can be held in a sublevel l = 3? how many electrons can be held in the energy level n = 4? how many electrons in an atom can share the quantum numbers n = 4 and l = 3?