Science·Matter & Materials·conceptual
Atoms, Elements & Compounds
Explain the differences between atoms, elements, and compounds; describe the simple Bohr model of the atom (nucleus with protons and neutrons, electrons in shells); and write and interpret chemical symbols and simple formulae
Suggested ages 11–12
Evidence of understanding
- Defines atom, element, and compound and distinguishes between them with examples
- Draws a simple Bohr model of an atom labelling nucleus (protons/neutrons) and electron shells
- Reads a chemical formula to identify the elements and number of each atom (e.g. H₂O, CO₂, NaCl)
- Identifies the difference between a mixture and a compound
Assessment prompt
If Atoms, Elements & Compounds saw the formula H₂O on a label, could they explain what it means — which atoms are involved, how many of each, and why water is a compound rather than just a mixture of hydrogen and oxygen?
Standards alignment
MS-PS1-1US · ngss-ms
MS-PS1-1
Next Generation Science Standards (NGSS) Middle School
KS3.Sci.Chem.AEC.1GB · uk-nc-2013
Bohr Model of the Atom
The national curriculum in England: Key stages 1 and 2 framework document · KS3
KS3.Sci.Chem.AEC.2GB · uk-nc-2013
Atoms, Elements and Compounds
The national curriculum in England: Key stages 1 and 2 framework document · KS3
KS3.Sci.Chem.AEC.3GB · uk-nc-2013
Chemical Symbols and Formulae
The national curriculum in England: Key stages 1 and 2 framework document · KS3