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7. reaction temperature change absorbed heat energy feels cold Endothermic

8. periodic table atomic number average weight mostly nucleus protons & neutrons Atomic Mass

9. charge gained electron extra lost Ion

10. new physical change reaction fizz produce light Chemical Change

11. periodic table protons element unique electrons positive Atomic Number

12. chemical change nature matter periodic table reactivity Chemical Property

13. reaction temperature change released energy hot Exothermic

14. abbreviation periodic table element name letters Chemical Symbol

15. elements combine put together periodic table two different Compound

16. small negative charge orbit atom Electron

17. elements formulas interact equation reacts Reactant

18. simple matter periodic table atom symbol Element

19. electrons orbit rings negative cloud Energy Level

20. number formula chemical specific element atom Subscript

21. column element valence electrons periodic table same Group

22. atom element neutron different atomic mass Isotopes

23. periodic table left right transition element Metals

24. results answer completed equation new substance Product

25. neutral 1 amu atomic mass no charge nucleus Neutron

26. element right noble gasses property periodic table Nonmetals

27. liquids solid chemical reaction indicator Percipitate

28. center atom protons neutrons middle Nucleus

29. row element periodic table energy level symbol Period

30. chart Mendeleev element row column Periodic Table

31. shape form appearance color odor Physical Change

32. particle positive nucleus electron periodic table Proton

33. balanced equal atom subscript coefficient Law Of Conservation Of Mass

34. negative energy level last outer share Valence Electron

35. formula same different two or more substance Molecule

36. periodic table group outer shell full 18 Nobel Gas

37. liquid dangerous chemical chlorine toxic fume Hydrochloric Acid

38. number formula chemical molecules big Coefficient