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5. charge equal in magnitude to that of an electron, but of opposite sign.
8. A chemical reaction that absorbs heat
10. Earth metals group 2 elements in the periodic table their reactivity is not as strong as alkali metals
11. Oxygens Chemical symbol
13. Hydrogens symbol
14. The basic unit of a chemical element
16. A substance that is made up of one kind of matter, which has a unique set of properties
17. A combo of elements
18. A change when a new substance is made
22. A reaction where all the products will remain and be accounted for
24. Mass of one element calculated from the total number of protons and neutrons

1. 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.
2. A stable subatomic particle with a charge of negative electricity, found in all atoms and acting as the primary carrier of electricity in solids.
3. Number of protons in the nucleus of one atom of an element
4. A change in appearance
6. A chemical reaction that releases heat
7. a element that has both metallic and nonmetallic properties
9. the most reactive of all elements
11. A reaction where some of the products can be lost
12. metals Group 1 elements in the periodic table not including hydrogen most reactive
15. a substance that helps a chemical reaction to proceed more quickly
19. Hydrogens Chemical symbol
20. Group 18 elements in the periodic table
21. The positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.
23. Water's chemical formula