GSCI 163. Lecture 5. Review. Electrons in an atom are distributed in shells, orbitals and energy levels. When electrons absorb photons they jump to higher orbitals They move back up by emitting a photon whose energy correspond to the change in energy level. Activity.
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Semi-metals have both metallic and non-metallic properties
He ~ 0.064 nm
Cs ~ 0.47 nm
Hardest elements to remove one electron from
Octet rule: atoms will combine with other atoms in such a way that gives a full shell of 8 electrons
Symbol of the element
Number of atoms of the element
There are no rules for these. Their names are learned individually
NaCl – Sodium Chloride
HCl – hydrogen chloride
Rule: name of the metal + the name of
of the polyatomic ion
ZnSO4 – Zinc Sulfate