Angola 12th Grade Chemistry National Exam Practice Questions - Angola 12th Grade National Examination - Chemistry (Exame Nacional De Química 12.a Classe - INADE MED) Exam

Oxygen has a paired electron in one of its 2p orbitals, resulting in increased electron-electron repulsion that makes it easier to remove Nitrogen has a smaller atomic radius than oxygen, holding its outer electrons more tightly Oxygen's outer electrons experience significantly greater shielding from inner core electrons Nitrogen has a completely filled 2p subshell, giving it noble gas stability