- Understand that all substances are made of atoms and that an atom is the smallest part of an element.
- Represent atoms of elements using chemical symbols (e.g., O, Na).
- Identify elements in Groups 1 and 7, and the first 20 elements in the periodic table.
- Describe how compounds are formed from elements by chemical reactions involving energy changes.
- Represent chemical reactions using word equations and balanced symbol equations.
- (HT only) Write balanced half equations and ionic equations where appropriate.
