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Diatomic Elements
H2
N2
O2
F2
Cl2
Br2
I2
Transition Metals with Fixed Charges
Ag+
Zn2+
Cd2+
Pb2+ (a lot of times)
Sc3+
Elements that exist as molecules
Sulfur: S8
White phosphorus: made of S4
Red phosphorus: chains of S
A connected three-dimensional array of atoms: S, Si, C
Ca(OH)2
a strong base that is only slightly soluble, so it’s written as (s) not (aq)