Unit 1

Unit 1 Main Ideas:

  • Three basic laws describe how matter behaves in chemical reactions.
  • Compounds contain atoms in whole-number ratios.
  • Atoms can be subdivided into smaller particles.
  • Atoms contain positive and negative particles.
  • Atoms have small, dense, positively-charged nuclei.
  • A nucleus contains protons and neutrons.
  • The radii of atoms are expressed in picometers.
  • Light has characteristics of both particles and waves.
  • When certain frequencies of light strike a metal, electrons are emitted.
  • Electrons exist only in very specific energy states for atoms of each element.
  • Bohr’s model of the hydrogen atom explained electron transition states.
  • Mendeleev’s periodic table grouped elements by their properties.
  • Moseley arranged elements by their atomic numbers.
  • Modern periodic tables arrange the elements by both atomic number and properties.
  • Electrons have wave-like properties.
  • The speed and position of an electron cannot be measured simultaneously.
  • Orbitals indicate probable electron locations.
  • Quantum numbers describe atomic orbitals.
  • Electrons fill in the lowest-energy orbitals first.
  • There are three ways to indicate electron configuration.
  • No electrons can occupy a higher-energy sublevel until the sublevel below it is filled.
  • The period of an element is determined by its electron configuration.
  • Atomic radii are related to electron configuration.
  • Removing electrons from atoms to form ions requires energy.
  • Adding electrons to atoms to form ions also requires energy.
  • When atoms become ions, their radii change.
  • Only the outer electrons are involved in forming compounds.
  • Atoms have different abilities to capture electrons.
  • The properties of d-block metals do not vary much.

Unit 1Unit 1 Main Ideas:Three basic laws describe how matter behaves in chemical reactions.Compounds contain atoms in whole-number ratios.Atoms can be subdivided into smaller particles.Atoms contain positive and negative particles.Atoms have smal...

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Course content

    • Content 6
    • Quiz for Unit 2
    • Measure Learning Survey