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PERIODIC TABLE OF ELEMENTS WebElements: A Periodic Table on the Web Periodic Table of Elements: Videos Interactive Periodic Table of Elements 1 H 1.00794 Hydrogen Element: The simplest form of matter Atom : the smallest piece of matter that can be identified as an element. 1 H 1.00794 Hydrogen Atomic Name: Hydrogen 1 H 1.00794 Hydrogen Atomic Number: Indicates the number of: protons electrons in a neutral atom. Atomic Mass: 1 H 1.00794 Hydrogen Measured in Atomic Mass Units or (AMU). 1 AMU is equal to the mass of a proton. DO NOT round the mass to the nearest whole number 1 H 1.00794 Hydrogen Atomic Symbol 1 or 2 letters. The symbol comes from its English or Latin name. Calculating the number of Protons Atomic # = # of Protons Ex: Hydrogen Atomic # = 1 # of Protons = 1 Calculating the number of Electrons # of Protons = # of Electrons Ex: Hydrogen # of Protons = 1 # of Electrons = 1 Calculating the number of Neutrons Atomic Mass (rounded to the nearest whole #) - Atomic # = # of Neutrons Ex: Hydrogen Atomic Mass = 1 Atomic # = 1 1-1 = 0 Hydrogen has no neutrons.