chemistry crossword

2. Neutral particle in the nucleus of a atom.
6. The smallest part of an element that is representative of an element.
9. An experiment where one or more products can escape.
12. An experiment where all the reactants are in a closed place.
13. Ability of a substance to conduct electricity or heat.
15. Amount of mass in a given volume of a substance.
16. Change that results when two or more substances react to create a different substance.
19. Combination of symbols that represent a compound.
20. Description of how a substance interacts with another.
22. a type of matter with a fixed composition
25. Shiny, malleable, ductile element that conducts electricity.

1. A positively charged particle in the nucleus of a atom.
3. Group 18 in the periodic table of elements; the most stable and unreactive elements.
4. Chemical combination of two or more elements in a specific ratio.
5. Positively charged centre of a atom.
7. Substance that helps a chemical reaction to proceed more quickly.
8. Number of protons in the nucleus of one atom of an element.
10. Mass of one atom of a element.
11. Group of very reactive metals.
13. A reaction that takes place when two or more substances react to make a different one.
14. Element that has both metallic and non-metallic properties.
17. Contains 2 or more gases, liquids, or solids substances blended evenly
18. Cloudy mixture in which tiny particles of one substance are held within another.
21. It changes its appearance but not its composition.
23. Dull, brittle element that doesn't conduct electricity.
24. Invisible negatively charged particle that orbits the nucleus of a atom.