PERIODIC TABLE
Atomic #
Element
Atomic Weight
Symbol
18
Argon
39.948
Ar
4
Beryllium
9.01218
Be
55
Cesium
132.9054
Cs
66
Dysprosium
162.5
Dy
68
Erbium
167.26
Er
9
Flourine
18.9984
F
31
Gallium
69.72
Ga
2
Helium
4.0026
He
77
Iridium
192.22
Ir