Using spdf notation, what is the electron configuration for a neutral atom of beryllium

Afamily is one another name for a group on the table of elements.

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?

How many moles are contained in 5.6 l of h2 at stp