Chemistry Crossword

3. metals Group 1 elements in the periodic table not including hydrogen most reactive
4. A subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
5. Earth metals group 2 elements in the periodic table their reactivity is not as strong as alkali metals
6. A chemical reaction that absorbs heat
9. Hydrogens Chemical symbol
10. a element that has both metallic and nonmetallic properties
11. Hydrogens symbol
13. Group 18 elements in the periodic table
14. Number of protons in the nucleus of one atom of an element
15. A change in appearance
17. A reaction where some of the products can be lost
20. The basic unit of a chemical element
21. the most reactive of all elements
22. A combo of elements

1. A stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
2. Mass of one element calculated from the total number of protons and neutrons
6. A chemical reaction that releases heat
7. Oxygens Chemical symbol
8. A change when a new substance is made
11. Water's chemical formula
12. a substance that helps a chemical reaction to proceed more quickly
15. A substance that is made up of one kind of matter, which has a unique set of properties
16. A reaction where all the products will remain and be accounted for
18. charge equal in magnitude to that of an electron, but of opposite sign.
19. The positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.