Junior Cert Science - Chemistry - Atomic Structureatom3a.gif

Gap-Filling Quiz

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   atomic      atomic number      electrons      element      mass      mass number      negative      Neutrons      nucleus      one      proton      protons      three   
An atom is the smallest part of an which still retains the properties of that element. Atoms are made up of basic particles, the , neutron and the electron. Protons have a positive charge and are located in the of the atom. have no charge, and are also to be found in the nucleus. Electrons have a charge and are found orbiting around the nucleus. Protons and neutrons have a mass of atomic mass unit (a.m.u.). Electrons have a much smaller . The number of in an atom of an element is equal to the number of protons in the same atom. The number of an element is equal to the number of in an atom of that element. The of an atom is equal to the sum of the number of protons and neutrons in that atom. The number of neutrons is calculated by subtracting the from the mass number.