Atomic Number and Mass

Lesson 12 from the textbook was introduced with a brief review of atomic number and atomic mass.  Key learnings:

  • Atomic number = # of protons in one atom of a given element
  • Protons have a positive charge
  • Electrons have a negative charge
  • Neutral atoms have equal numbers of protons and electrons
  • Atomic mass = (# of protons) + (# of neutrons) in one atom of a given element
  • Neutrons have no charge

Students then worked in pairs to complete the Lesson 12 Worksheet.  For homework, students were assigned Lesson 12 textbook questions 1-7 (page 60).

All students also received a copy of their progress report.  Students should make every effort to catch up on missing work this weekend and take notes on chapters 1-3 in preparation for the quiz on Tuesday.


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