Why did Mendel become decide to become a teacher?

Which electron configuration represents the electrons in an atom of sodium in the ground state at stp

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?

Light waves are as they pass through the