Protactim
Atomic Number: 91
Atomic Weigt: 231.0
Symbol: Pa
The atomic weight of protactinium is 231,03588.
The atomic radius of protactinium is 180 pm.
Protactinium, with the chemical symbol Pa, is the chemical element with the atomic number 91.
The chemical symbol of protactinium is Pa.
Protactinium has 91 electrons; the valence is 4 or 5.
Pottasium is a meta element. Atomic mass of it is 39.
Lawrencium (Lr) with the atomic number 103.
Because the properties (chemical and physical) of protactinium are the general properties of metals.
The atomic number for the element Protactinium (Pf) is 91.
potasium is a metal element. Atomic mass of it is 39.
The element with atomic number of 91 is protactinium, Pa. It is an inner transition metal.
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.