Across
- 3. a form of matter with a constant chemical composition and specific physical properties
- 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
- 6. any physical substance that possesses mass and occupies space, acting as the building block for all observable objects in the universe
Down
- 1. the fundamental building block of ordinary matter, representing the smallest unit of an element that retains its chemical properties
- 2. the smallest identifiable unit of a pure substance, composed of two or more atoms held together by strong covalent bonds
- 4. a form of matter with a constant chemical composition and specific physical properties