Chemistry Crossword

2. group 17 elements in the periodic table; the most reactive non-metals
3. group of atoms joined by covalent bonds
5. number of protons in the nucleus of one atom of an element
8. substance made of only one kind of matter, which has a unique set of properties
12. chemical combination of two or more elements in a specific ratio
14. chemical reaction that absorbs energy
16. pure substance that cannot be broken down into other substances; substance made up of only one type of atom
17. combination of symbols that represent a compound; the formula identifies the elements in the compound and the amount of each element
21. vertical column of elements in the periodic table; elements in a family all have similar chemical properties; also called a family
22. mass of one atom of an element calculated from the total number of protons, neutrons, and electrons of that atom; measured in atomic mass units (amu)
23. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
24. new substance produced in a chemical reaction between reactant

1. substance that reacts with another substance or substances in a chemical reaction to create new substances with different properties
4. change that results when two or more substances react to create a different substance or substances; the new substances have completely different properties from the original ones
6. element that has both metallic and non-metallic properties
7. shiny, malleable, ductile element that conducts electricity
9. the smallest part of an element that is representative of that element; a neutral particle made up of a nucleus containing protons and neutrons, and in which the number of electrons equals the number of protons
10. pure substance formed when at least one metal and one non-metal combine
11. group 18 elements in the periodic table; the most stable and unreactive elements
13. heterogeneous mixture; mixture in which the different substances that make up the mixture are visible
15. horizontal row of elements in the periodic table
18. combination of pure substances; unlike a compound, the components of a mixture do not combine chemically and are not always in the same ratio
19. vertical column of elements in the periodic table; elements in a family all have similar chemical properties; also called a group
20. slow chemical change that occurs when oxygen in the air reacts with a metal