Periodic System for Chemists
Back to Promethium

Promethium Atomic Mass

Pm - Atomic Number 61

Atomic Mass
144.913 u
Ranking:
#58 of 118
Highest
Ts: 294.00
Lowest
H: 1.01

About the Atomic Mass

Atomic mass is the weighted average of all naturally occurring isotopes.

Top 10 by Atomic Mass

Top 10 by Atomic Mass

#1 Ts Tennessine
294.00 u
#2 Og Oganesson
294.00 u
#3 Lv Livermorium
293.00 u
#4 Fl Flerovium
289.00 u
#5 Mc Moscovium
288.00 u
#6 Nh Nihonium
286.00 u
#7 Cn Copernicium
285.00 u
#8 Ds Darmstadtium
281.00 u
#9 Rg Roentgenium
281.00 u
#10 Mt Meitnerium
276.00 u

Related Properties

Atomic RadiusCovalent RadiusVan der Waals Radius