PLS HELP DOING A TEST What are the maximum number of electrons for each energy level (from 1 to 7)?

In 2002, the rare earth elements mine in mountain pass, california was closed because

Ammonium perchlorate nh4clo4 is the solid rocket fuel used by the u.s. space shuttle. it reacts with itself to produce nitrogen gas n2 , chlorine gas cl2 , oxygen gas o2 , water h2o , and a great deal of energy. what mass of nitrogen gas is produced by the reaction of 2.1g of ammonium perchlorate?

What is the work done by the electric force to move a 1 c charge from a to b?