One evening last summer, as I strolled along the promenade in Limbe, a small, scenic port town in southwestern Cameroon, I was stopped by a well-dressed young man who greeted me warmly and took me by the hand.
Phosphorus has 3 shells. The outer shell contains 5 electrons. The electronic configuration is :- <br /> 1s2, 2s2, 2p6, 3s2, 3p3.
As the atomic masses of the elements in the periodic table increases, the number of atoms in 1 mole of neon, a mole of calcium contains remains the same The atomic number of neon is 10. The atomic number of calcium is 20. compared with a mole of neon a mole of calcium contains an equal number of atoms To determine the molar mass of an element, one must know the elements