Across
- 1. mixture: a mixture in which two or more substances are evenly mixed, but not bonded together
- 5. positively charged particle in the nucleus of an atom
- 8. mixture: a mixture in which the substances are not evenly mixed
- 9. substance made of only one kind of atom = 118 elements on periodic table
- 11. matter with a composition that is always the same
- 13. region at the centre of an atom that contains most of the mass of the atom
- 16. negatively charged particle that occupies the space in an atom outside the nucleus
- 19. uncharged particle in the nucleus of an atom
- 20. single; separate
Down
- 2. anything that has mass and takes up space
- 3. electrical property of some objects that determines whether the object is positive, negative, or neutral
- 4. one of two or more atoms of an element having the same number of protons, but a different number of neutrons
- 6. small particle that is the building block of matter
- 7. two or more atoms that are held together by chemical bonds and act as a unit
- 10. cloud: region surrounding an atom’s nucleus where one or more electrons are most likely to be found
- 12. matter that can vary in composition
- 14. substance made of two or more elements that are chemically joined in a specific combination
- 15. change: a change in matter in which the substances that make up the matter change into other substances with different chemical and physical
- 17. number: the number of protons in the nucleus of an atom of an element
- 18. atom that has a charge because it has gained or lost electrons