Chemistry crossword

2. homogeneous mixture; mixture of two or more pure substances that looks like one substance.
5. the most reactive non-metals
6. cause(a substance) to be deposited in solid form from a solution.
8. number of protons in a single nucleus of an element
10. substance that helps a chemical reaction proceed more quickly
11. mass of a substance that can dissolve in a given amount of solvent to form a saturated solution at a given temperature
12. change in the appearance or state of a substance that does not change composition
14. pure substance that cannot be broken down into other substances
15. horizontal row of elements in the periodic table
17. an experiment in which one or more products of a chemical reaction can escape
18. the mass of one atom of an element
19. a table in which elements are organized by their physical and chemical properties
21. property that describes the physical appearance and composition of a substance
22. neutral particle in the nucleus of an atom
23. workplace,hazardous,materials,information,system

1. atom that has become electrically charged
3. group 18 elements in the periodic table;the most stable and unreactive elements
4. A.M.U
7. element that has both metallic and non-metallic properties
9. the sum of the number of protons and neutrons in an atom
13. combination of symbols that represent a compound
16. substance that reacts with another substance or substances in a chemical reaction to create new substances with different properties
20. chemical combination of two or more elements in a specific ratio
22. positively charged centre of an atom