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Unit molecular model kit (basic set), 1981.

Unit molecular model kit (basic set), 1981.
3 4 c m
actual image size: 32cm x 26cm


Made by Cochranes of Oxford Ltd. Each ball represents an atom of a chemical element, and can be connected to other 'atoms' by means of bonds represented by inserting the connecting pegs in holes in the balls. The number of holes in a ball represents the number of molecular bonds atoms of different elements are able to form. This is determined by an element's valency, which is dictated by the number of electrons in the outermost shell of an atom of that element.

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© Science Museum / Science & Society Picture Library

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