atomic structure. learning goals  identify and describe particles which comprise atoms. ...

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  • Atomic Structure

  • Learning GoalsIdentify and describe particles which comprise atoms.Compare atoms and contrast forces inside.Determine subatomic particles from atomic number and mass number.

  • BellringerWhat is an atom?

    What does an atom look like?

  • Body EssentialsProteinLipids (Fat)CarbohydrateMacromolecules that aid in human performance.To understand their functions we must understand their structure.

  • Structure of the AtomIn order to understand atoms, we need to understand the idea of electric charge.We know of two different kinds of electric charge and we call them positive and negative.

  • Electric charge in matterWe say an object is electrically neutral when its total electric charge is zero.

  • Nucleus- small dense center of the atom.protons and neutronsElectron Cloud- outer part of atom where the electrons lie.

  • Inside an atom The mass of the nucleus determines the mass of an atom!!protons and neutrons are much larger and more massive than electrons.In fact, a proton is 1,836 times heavier than an electron! WOW!

  • Proton and Neutron weigh almost the same

  • Force inside atomsElectrons are bound to the nucleus by the attractive force between electrons (-) and protons (+).

  • Force inside atomsWhat holds the nucleus together? There is another force that is even stronger than the electric force.We call it the strong nuclear force.

  • How are atoms of various elements different?The atoms of different elements contain different numbers of protons in the nucleus.Because the number of protons is so important, it is called the atomic number.


    Hydrogen ALWAYS has 1 protonHelium ALWAYS has 2 protonsChlorine ALWAYS has 17 protons

  • What info can we gather from the Periodic Table?Atomic Number =# of protons / # of electronsSymbol of elementAtomic Mass =(# of protons) + (# of neutrons)

  • Check for Understanding!How many protons, neutrons, and electrons are in iron given the periodic table?Answer:26 protons, 26 electrons, and 30 neutrons

  • Calculating P, N, and EYou may need the Periodic Table to fill in this chart