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What is the percentage composition of carbon in the compound ch4

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !

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?