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Learn what atomic number is , how to find it and why it is important for chemistry. Atomic number is the number of protons in the nucleus of an atom and it identifies elements in the periodic table. Atomic Number (Z) Atomic Number of element is defined as the Number of the protons in nucleus. It is denoted by the Letter Z Z = Number of protons present in nucleus For example, The number of protons in hydrogen atom is 1,So Atomic Number of Hydrogen is 1 Similary the number of protons in Sodium atom is 11, So Atomic Number of Sodium is 11 Atomic Number of element depends only on the number of protons in the elements. it does not depends on number of electrons or neutron. We may use this ... Learn what atomic number is , how to calculate it and why it is important for the periodic table. Find out the difference between atomic number and mass number , and see examples of isotopes and orbital energy levels. The atomic number denotes the number of electrons or protons in a neutral atom, whereas the mass number denotes the total number of protons and neutrons present in an atom.
