Unit 03 Atoms and the Periodic Table

Unit Notes


  • Unit Bellringers Click
  • Unit Notes Click
  • Periodic Table Families Notes (Blank) Click
  • The Periodic Table Click
    • Periodic Table Family Notes Click
  • The Atom Click
  • Calculating p/n/e WS Click
  • Creating your Periodic Table Click
  • Perodic Table Fun Packet Click
  • Practice Test (study guide) Click
    • Practice Test Answer Key Click

Student Must Know

Key Words

The Atom

  • An element is matter that is composed of one type of atom, which is the smallest piece of matter that still retains the property of that element.
  • The positively charged center of the atom is the nucleus.
  • Protons are in the nucleus and have a positive charge, neutrons are in the nucleus and have no charge, and electrons are in the electron cloud outside the nucleus and they have a negative charge.
  • The nucleus contains most of an atom’s mass.
  • Average atomic mass is the average number of protons and neutrons in an atom of an element.
  • Atomic number is the number of protons in an atom while the mass number is the number of protons and neutrons in an atom.
  • Isotopes of the same element have differing neutron numbers.

  • Electron dot diagrams use the symbol of the element and dots around it representing electrons in the outermost energy level.

The Periodic Table

  • Elements are arranged in the periodic table by atomic number.
  • Groups are vertical columns and periods are horizontal rows.
  • Elements in the same group have similar properties.
  • Alkali metals are in group 1 and are very reactive.
  • Alkaline earth metals are in group 3 and have 2 outermost electrons.
  • Transition metals are in groups 3-12.
  • Nonmetals are elements that are gases or brittle solids at room temperature.
  • Halogens are in group 17 and are very reactive.
  • Noble gases are in group 18 and are chemically stable due to its outer energy level being full of electrons.
  • Metalloids have metallic and nonmetallic properties.
  • The boron family is group 13 and have 3 valence electrons.
  • The carbon family is group 14 and have 4 valence electrons.
  • The nitrogen family is group 15 and have 5 valence electrons.
  • The oxygen family is group 16 and have 6 valence electrons.
  • Trends of atoms are easy to visualize using periodic table.
-electron could
-atomic mass
-atomic number
-mass number
-average atomic mass
-periodic table
-electron dot diagram
-Lewis Dot
-valence electrons
-alkali metals
-alkaline earth metals
-noble gases
-transition metals
-boron family
-carbon family
-nitrogen family
-oxygen family