Into which subshell is an electron added into a CL Atom

Aradio signal from a gps satellite take only about 0.067 seconds to reach a gps reciever. if the speed of light is about 300,000km/s, then approximately how far away is the reciever from from the satellite?

How many grams of oxygen gas are contained in a 15 l sample at 1.02 atm and 28°c? show your work.

What is a possible quantum number set for an electron in the 3s orbital of a magnesium atom