Level 2
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H
Hydrogen
He
Helium
Li
Lithium
Be
Beryllium
B
Boron
C
Carbon
N
Nitrogen
O
Oxygen
Ne
Neon
Na
Sodium
Mg
Magnesium
Al
Aluminium
Si
Silicon
P
Phosphorus
S
Sulfur
Cl
Chlorine
Ar
Argon
K
Potassium
Ca
Calcium
Cr
Chromium
Mn
Manganese
Fe
Iron
Co
Cobalt
Ni
Nickel
Cu
Copper
Zn
Zinc
Br
Bromine
Ag
Silver
Sn
Tin
I
((b+)(Z+^2) + (b-)(Z-^2))/2
w
-PexΔV
Au
Gold
Hg
Mercury
Pb
Lead