A mystery element contains 11 electrons. Which group of the periodic table will it belong to?

Calculate the number of molecules present in 0.750 mol of mgo.

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?

8. what happens to matter during a chemical reaction