chemistry

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Across
  1. 2. / are elements that have similar physical or chemical properties
  2. 4. reaction / A process that produces a chemical change is called a
  3. 6. / a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction
Down
  1. 1. / the basic unit of a chemical element
  2. 3. change / change occurs when the physical properties are changed, such as size or shape
  3. 4. / a thing that is composed of two or more separate elements; a mixture
  4. 5. / each of more than one hundred substances that cannot be chemically interconverted or broken down into simpler substances and are primary constituents of matter