Chemistry Crossword.

3. mass of one atom of an element calculated from the total number of protons, neutrons, and electrons of that atom
6. cloudy mixture in which tiny particles of one substance are held within another and particles cannot be separated out from the other substance\
7. positively charged centre of an atom
12. property that describes the physical appearance and composition of a substance
14. an experiment in which all reactants and all products of a chemical reaction are accounted for
15. a reaction that takes place when two or more substances react to form new substances
17. group 2 elements in the periodic table
18. dull, brittle element that does not conduct electricity
19. amount of mass in a given volume of a substance
21. group 18 elements in the periodic table
23. homogeneous mixture

1. description of a solid that can be stretched into a long wire
2. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
3. the smallest part of an element that is representative of that element
4. number of protons in the nucleus of one atom of an element
5. slow chemical change that occurs when oxygen in the air reacts with metal
8. substance that reacts with another substance or substances in a chemical reaction to create a new substances with different properties
9. metals group 1 elements in the periodic table
10. principle that matter is not created or destroyed in a chemical reaction
11. group of atoms acting as one
12. change in the appearance or state of a substance that does not change the composition
13. changing of state from a solid to a liquid
16. chemical combination of two or more elements in a specific ratio
20. an experiment in which one or more products of a chemical reaction can escape
22. mass of a substance that can dissolve in a given amount of solvent to form a saturated solution at a given temperature