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Across 1. an atom with a different number of neutrons in its nucleus 4. the universal signs for elements are called ------ 6. state of matter with no definite shape and no definite volume 10. a charged particle formed when an atom gains or loses electrons 11. consists of bonded atoms 13. a substance of two or more substances that can be physically seperated 14. the substance the does the dissolving when combined with another subtance 16. a substance that is formed from elements chemically bound in a set ratio 19. weighted average of the masses of the constituent isotopes of an element (two words) 21. a characteristic of a pure substance that describes its ability to change into different substances (two words) 23. the smallest particle of an element 25. the study of matter and how matter can change 26. anything that has mass and takes up space 27. a solid that comes out from a solution during a chemical reaction 28. positively charged core of an atom

Down 2. a characteristic of a pure substance that can be observed without changing it into another substance (two words) 3. the substance that gets dissolved when combined with another substance 5. a force of attraction between two atoms 7. state of matter with definite shape and definite volume 8. a ------- is composed of one kind of atom (aka pure substance) 9. ------- electrons outside filled rings or shells (aka outer electrons) 11. a -------- has atoms that bond by sharing their outer electrons 12. -273.15 degrees C or 0 degrees F (the zero point on the absolute temperature scale) (two words) 15. lemonade is an example of a/an (this word) mixture 17. sand is an example of a/an (this word) mixture 18. compounds that share characteristic properties in the kind of reactions they undergo 20. a compound that changes color in the presence of an acid or base 21. a -------- change is where substances combine or break apart to form new substances 22. state of matter with no definite shape, but definite volume 24. group of compounds that can be identified by their common properties