Note that, each elementВ may contain more isotopes, therefore this resulting atomic mass is calculated from naturally-occuring isotopes and their abundance. The atomic mass is carried by the atomic nucleus, which occupies only about 10 -12В of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. The atomic mass or relative isotopic mass refers to the mass of a single particle, and therefore is tied to a certain specific isotope of an element. Mass numbers of typical isotopes of NickelВ are 60 61 62 64. IsotopesВ are nuclides that have the same atomic number and are therefore the same element, but differ in the number of neutrons. The difference between the neutron number and the atomic number is known as the neutron excess: D = N вЂ“ Z = A вЂ“ 2Z.ДЇor stable elements, there is usually a variety of stable isotopes. NeutronВ number plusВ atomic numberВ equals atomic mass number: N+Z=A. The total number of neutronsВ in the nucleus of an atom is called the neutronВ numberВ of the atom and is given the symbol N. The total electrical charge of the nucleus is therefore +Ze, where e (elementary charge) equals to 1,602 x 10 -19В coulombs. Total number of protons in the nucleus is called the atomic numberВ of the atom and is given the symbol Z.

NickelВ is a chemical element with atomic number 28В which means there are 28 protons in its nucleus. Atomic Number вЂ“ Protons, Electrons and Neutrons in Nickel

Nickel periodic table