Which of the following states that an orbital can contain two electrons only if all other orbitals at that sublevel contain at least one electron? 8

How much energy moves onto the next level, in an energy pyramid

Tin has ten stable isotopes. the heaviest, 124sn, makes up 5.80% of naturally occuring tin atoms. how many atoms of 124sn are present in 82.0 g of naturally occurring tin? what is the total mass of the 124sn atoms in this sample?

Place the elements below in order of decreasing ionization energy. aluminum(al) chlorine(cl) magnesium (mg) sulfur(s)