For isotopes, average atomic mass is considered. Like most gaseous elements, hydrogen is diatomic (. Protium consist of 1 electron and 1 proton, without any neutron, hence it has 1.007 amu as its atomic mass, while deuterium, has 1 electron, 1 proton, and 1 neutron, so it has a mass of 2.014 amu, while tritium has 1 electron, 1 proton, and 2 neutrons, so it has an atomic mass 3.021 amu. The element is usually classed in group 1 (or Ia) of the periodic table. However, the Periodic table generally displays only the symbol of the element and not its entire name. Hydrogen has 3 isotopes, protium, deuterium and tritium. The periodic table of elements is widely used in the field of Chemistry to look up chemical elements as they are arranged in a manner that displays periodic trends in the chemical properties of the elements. Gram atomic mass of an atom is equal to Avogadro number, $6.022\times g$ At the very bottom is the name of the element (e.g., hydrogen). Below is the relative atomic mass, as calculated for the isotopes found naturally on Earth. In the middle is the letter symbol for the element (e.g., H). ![]() At the upper left is the atomic number, or number of protons. While, the expression of this mass in grams is called gram atomic mass. Image showing the 'anatomy' of a periodic table entry. ![]() Atomic mass is measured and expressed in atomic mass units, amu. ![]() Hint: Atomic mass of any element is the number of protons and neutrons in that atom. H Hydrogen: Greek elements hydro-and -gen, water-forming 1 1 s-block: 1.0080: 0.000 089 88: 14.01: 20.28: 14.304: 2.
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