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The atom

Core concepts and learning points for this section:

Syllabus Points

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 form negative ions by gaining electrons

Supplement

5.1.1.3 Describe how the scattering of alpha ( α ) particles by a sheet of thin metal supports the nuclear model of the atom, by providing evidence for: (a) a very small nucleus surrounded by mostly empty space (b) a nucleus containing most of the mass of the atom (c) a nucleus that is positively charged