Introduction to the Atom

Derek Cumberbatch
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Slide set on the atom, including links to video and quiz

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Sarah Egan
Created by Sarah Egan over 3 years ago
Derek Cumberbatch
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Slide 2

    NUCLEUS: the central section of the atom made up of sub-atomic particles called protons and neutrons ELECTRONS: sub-atomic particles that revolve around the nucleus in paths called orbits this movement of electrons creates an electron cloud
    Structure of the atom
    Caption: : Structure of the atom

Slide 3

    Protons have a positive charge (Charge = +1) Electrons have a negative charge (Charge = -1) Neutrons are neutral (No charge) Usually atoms are electrically neutral which means that the number of protons in the atom is equal to the number of neutrons.Protons and neutrons have the same mass, but electrons are 2000 times smaller than the mass of proton. (>>>>>>)
    Protons and Neutrons
    Caption: : From: profmattstrassler.com

Slide 4

    Atomic Number: Number of protons in the atomMass Number: Number of protons + Number of neutronsthis means:Number of neutrons in an atom = Mass number MINUS Atomic number
    Atomic numbers
    Caption: : Helium: Atomic number = 2, Mass number = 4

Slide 5

    Describing atoms
    The atomic number of fluorine is 9 and its mass number is 19. (rounded from 18.998, see left) How many (a) protons, (b) electrons and (c) neutrons does a neutral fluorine atom have? (a) 9 protons(b) 9 electrons (same number as the number of protons)(c) 10 neutrons (19 – 9)
    Caption: : Flourine

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Slide 7

    Isotopes
    Scientists used to think that all atoms of a particular element were identical. We have discovered that some elements have two or  three different types of atom.They will all have the same number of protons but they could have a different number of neutrons. e.g. some atoms of carbon have 6 neutrons, while other atoms of carbon have 7 neutrons, and others have 8 neutrons. We say these atoms are isotopes of each other. Isotopes are atoms that have the same atomic number but a different mass number