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SCH4U - Atomic Structure & The Periodic Table THE PERIODIC TABLE The structure of the periodic table, and the corresponding properties of the elements are explained through quantum mechanics. The ___________arrangement ______________ of electrons within orbitals determines the chemical behaviour of every element. ORBITAL ENERGIES Each of the orbital, and their sublevels occupy different energy levels. The __________farther _______________ the orbitals are from the nucleus, the __________closer_______________ together they are, and the subshells tend to “overlap” Electrons fill these energy levels in order of increasing energy – _____s____ ____p_____ _____d____ _____f____ Electrons in higher orbitals tend to possess more _______energy __________________ AUFBAU PRINCIPLE A maximum of two electrons are put into orbitals, in the order of increasing orbital energy: the lowest-energy orbitals are filled before electrons are placed in higher-energy orbitals The third shell ( n =3) is split into 3 subshells ( s, p, d ) The highest-energy (outermost) subshell is close in energy to that of the first subshell (4s) of the next shell ( n= 4) Once there are 8 electrons in the first shell the fourth

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