Atomic Structure and The Periodic Table

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Matter and Mass

  • Atoms are the smallest building blocks of elements. They are made from three types of subatomic particle: protons, neutrons and electrons
  • Protons and neutrons are held together tightly in a tiny space in the centre of the atom called the nucleus. Electrons move around in a large area surrounding the nucleus. 

(http://www.antonine-education.co.uk/Image_library/Physics_1/Particles/Lithium_Atom.JPG)

  • Protons have a positive charge. Electrons have a negative charge. Neutrons are neutral (they have no charge). This makes it easier to remember. NEUtrons are NEUtral. 
  • There is the same amount of positive protons as negative electrons. This means that an atom has no overall charge. 
  • Elements are made from only one type of atom. Different elements have different numbers of protons in the nucleus. 
  • The mass of a proton is 1 atomic mass unit.The mass of the other particles are

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