Science Crossword

1. positively charged particle in the nucleus of an atom
3. change of state from liquid to gas
4. anything that has mass and takes up space
7. an experiment in which all reactants and all products of a chemical reaction are accounted for
10. shiny, malleable ductile element that conducts electricity
11. combination of symbols that represent a compound;the formula identifies the element in the compound and the amount of each element
12. substance that reacts with another substance or substances in a chemical reaction to create new substances with different properties
14. slow chemical change that occurs when oxygen in the air reacts with metal
15. the smallest part of an element that is representative of the 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
16. group of atoms acting as one
18. neutral particle in the nucleus of an atom
19. horizontal row of elements in the periodic table
22. group 18 element in the periodic table; the most stable and unreactive elements
23. catalyst involved in chemical reactions in living things

1. new substance produced in a chemical reaction between reactants
2. pure substance formed when non-metals combine
5. number of protons in the nucleus of one atom of an element
6. vertical column of elements in the periodic table; elements in a family all have similar chemical properties; also called a family
8. invisible negatively charged particle that orbits the nucleus of an atom
9. chemical reaction that occurs when oxygen reacts with a substance to form a new substance and give off energy
11. substance that helps a chemical reaction to proceed more quickly
13. cloudy mixture in which tiny particles of one substance are held within another and particles cannot seperate
17. 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
20. group 17 elements in the periodic table; the most reactive non-metals
21. element that has both metallic and non-metallic properties