As covered previously in the Matter topic, atoms are the building blocks of nature

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All matter is made up of atoms

Atoms are very very small

How many atoms do you think would be in a full stop on a piece of paper? Find out here







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More detailed information about the history of the atom can be found at Timeline of atomic history

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ATOMIC STRUCTURE

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  • The centre of the atom is called the NUCLEUS

  • The nucleus contains the PROTONS AND NEUTRONS

  • The ELECTRONS are very fast moving and orbit around the NUCLEUS


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USING THE PERIODIC TABLE

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  • The periodic table is ordered in increasing size of atoms, the smallest atom is hydrogen in the top left corner

  • The rows going across are called PERIODS

  • The columns going down are called GROUPS



INTRODUCING.........................

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Protons (equals)

Electrons (which is)

Atomic number

Mass number

Atomic number (plus)

Neutrons



ATOMIC NUMBER AND MASS NUMBER

Every element on the periodic table has 2 numbers associated with it


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  • The bigger number is always the MASS NUMBER

  • MASS NUMBER is the number of particles in the nucleus, the protons and neutrons

  • The smallest number is always the ATOMIC NUMBER

  • The atomic number tells us how many PROTONS in the nucleus

  • For an atom, number of protons is the same as number of electrons


For example carbon, C

Has a mass number of 12 and atomic number of 6

Using PEAMAN we can work out how many of each particle


protons

neutrons

electrons

number

6

12 - 6 = 6

6





MORE INFORMATION
http://www.chem4kids.com/files/atom_structure.html