Matter Test reveiw croosword

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Across
  1. 3. a form of matter with a constant chemical composition and specific physical properties
  2. 5. a fundamental, distinct part of a whole, or a pure chemical substance consisting of atoms with the same number of protons that cannot be broken down further by ordinary chemical means
  3. 6. any physical substance that possesses mass and occupies space, acting as the building block for all observable objects in the universe
Down
  1. 1. the fundamental building block of ordinary matter, representing the smallest unit of an element that retains its chemical properties
  2. 2. the smallest identifiable unit of a pure substance, composed of two or more atoms held together by strong covalent bonds
  3. 4. a form of matter with a constant chemical composition and specific physical properties