223
FrIO4
Symbol:Fr Atomic number:87 Atomic mass:223 Group#:1 Group name:Alkali Metal Color:Unknown/Metallic looking but that's a guess Standard state:Solid Classification:Metal Density:Unknown Melting point:Unknown Boiling point:Unknown Date discovered:1939 Who discovered it:Marguerite Catherin Perey Location discovered:France
Atomic no.=no. of protons Atomic mass=no. of protons+no. of neutrons Hence, atomic mass is greater
The atomic mass is the mass of a molecule, atomic particle or sub-atomic particle.
Atomic mass
The atomic mass (or weight) of silver is 107.8682 amu (atomic mass units)
The atomic mass number of aluminum is 27. The atomic mass of aluminum is 26.98115386
Cobalt has an atomic mass of 58.933195(5) while nickel has an atomic mass of 58.6934(4). Nickel has the lower atomic mass.
The atomic mass of arsenic is approximately 74.92 atomic mass units.
The atomic mass of potassium is approximately 39.10 atomic mass units.
== == Atomic Mass: 54.93805 amu
Sulfur has an atomic mass of approximately 32.06 atomic mass units.