Pottasium is a meta element. Atomic Mass of it is 39.
The atomic weight of protactinium is 231,03588.
potasium is a metal element. Atomic mass of it is 39.
Protactinium has 29 isotopes; each isotope has a different mass. For details of isotopic masses see at: http:/en.wikipedia.org/wiki/Isotopes_of_protactinium.
relative Atomic Mass
relative atomic mass
Protactinium has 91 electrons; the valence is 4 or 5.
The atomic radius of protactinium is 180 pm.
the relative atomic mass for the element potassium is 39.0983
Protactinium, with the chemical symbol Pa, is the chemical element with the atomic number 91.
It would be actinium with 89 protons and a mass of 230.
Relative atomic mass, also called atomic weight, is listed on the periodic table for each element. There is no element listed on the periodic table with a relative atomic mass of 15.5.
The relative atomic mass of magnesium is approximately 24.305.