It is widely distributed in space in cosmic dusts, planetoids, and planets as various forms of silicon dioxide (silica) or silicates. The atomic mass of silicon is the average mass. Silicon is the eighth most common element in the universe by mass, but very rarely occurs as the pure element in the Earth's crust. With a standard atomic weight of circa 1.008, hydrogen is the lightest element on the periodic table. The silicon element is represented by Si in the periodic table which has an average atomic mass of 28.08 amu. There you can find the metals, semi-conductor(s), non-metal(s), inert noble gas(ses), Halogens, Lanthanoides, Actinoids (rare earth elements) and transition metals. Hydrogen is a chemical element with atomic number 1 which means there are 1 protons and 1 electrons in the atomic structure. Please note that the elements do not show their natural relation towards each other as in the Periodic system. The unity for atomic mass is gram per mol. The lightest chemical element is Hydrogen and the heaviest is Hassium. The chemical elements ofįor chemistry students and teachers: The tabular chart on the right is arranged by Atomic mass (weight). This list contains the 118 elements of chemistry.
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