Across
- 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
Down
- 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