Periodic System for Chemists

Your periodic table, always with you.

Use it offline. Find elements quickly. Keep favorites and personal notes on iPhone and iPad.

Back to Einsteinium

Einsteinium Atomic Mass

Es - Atomic Number 99

Atomic Mass
252 u
Ranking:
#20 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

Van der Waals Radius

iPhone & iPad

Your periodic table, always with you.

  • Access element data offline, in the lab or in class.
  • Find elements quickly by name, symbol, or atomic number.
  • Save favorite elements and add your own notes.
Published App Store screenshots: periodic table, element details, and search (English).