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Chapter 4 Vocabulary

Across
Invented in 2002
Flexible, strong natural polymer found in cell walls
Threadlike piece of glass that can transfer light
Smaller particles from which polymers are built
Invented in 1909
Consists of high-energy waves
Estimating the age of fossils and rock
Spontaneous emission of radiation
Fast- moving electron given off by radioactive decay
Atomic nuclei of unstable isotopes release fast- moving particles
Melted sand that forms this clear solid
Invented in 1971
Large complex molecule built from smaller molecules
Down
Two or more substances in a new substance with different properties
Synthetic polymers that can be molded or shaped
Invented in 1869
2 protons, 2 neutrons, and positively charged
Hard, crystalline, solids made by heating clay to high temperatures
Invented in 1839
Reactions that involve the nucleus of an atom
Invented in 1934
Length of time needed for half of an atom to decay
Mixture of two or more elements that have properties of metal
Radioactive isotopes that can be followed through a chemical change