Structure 2.1.1 - When metal atoms lose electrons, they form positive ions called cations. When non-metal atoms gain electrons, they form negative ions called anions.

• Predict the charge of an ion from the electron configuration of the atom.

Guidance

• The formation of ions with different charges from a transition element should be included.

Tools and links

• Structure 3.1 - How does the position of an element in the periodic table relate to the charge of its ion(s)?
• AHL Structure 1.3 - How does the trend in successive ionization energies of transition elements explain their variable oxidation states?