Apr
11
awarded  Notable Question
2018
Sep
20
awarded  Popular Question
Aug
21
awarded  Notable Question
2017
Oct
24
awarded  Popular Question
Jul
20
awarded  Popular Question
2015
Dec
7
comment What is the size of the ammonium ion?
I finally found it :D It is 148 m^-12
Dec
6
asked What is the size of the ammonium ion?
Oct
12
asked Mass number, (relative) atomic mass, average mass
Oct
11
awarded  Supporter
Oct
10
asked What is the difference between reactant and reagent?
Oct
9
awarded  Student
Oct
8
awarded  Scholar
Oct
8
accepted Why is there no neutron in protium?
Oct
7
asked Why is there no neutron in protium?
Sep
23
awarded  Editor
Sep
23
revised Why is helium a liquid at absolute zero?
added 11 characters in body
Sep
23
asked Why is helium a liquid at absolute zero?