5.1.1 — The atom

Core

• 5.1.1.1 — Describe the structure of an atom in terms of a positively charged nucleus and negatively charged electrons in orbit around the nucleus
• 5.1.1.2 — Know how atoms may form positive ions by losing electrons or negative ions by gaining electrons

Supplement

• 5.1.1.3 — Describe how alpha-particle scattering supports the nuclear model by showing: a very small nucleus, mostly empty space, a massive nucleus, and a positively charged nucleus