vocab crossword

2. proton positive charge, located in the nucleus
4. law of conversation of mass states that in a chemical reaction, matter can't be created or destroyed
7. the smallest part of an element-the building block of matter
8. family a vertical group, based on same, or similar chemical or physical properties
9. chemical reaction the changes when an element is put together or pulled apart
10. a greek word that means indivisible
11. physical change is a type of change in which the form of matter is altered but one substance is not transformed into another
13. the center of an atom, that holds the protons and neutrons
14. physical property a characteristic that can be observed or measured
16. reactant the substance you start with
17. electron negative charge, that moves around the nucleus

1. product the substance you end with
3. the first person to discover atoms
5. period the horizontal rows, numbered 1-7
6. mass the number of protons and neutrons inside the nucleus
9. chemical change occur when a substance combines with another to form a new substance
10. molecule a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction
11. compound a substance that is made of 2 or more than 2 different elements
12. neutron neutral charge, located inside the nucleus
14. chemical property a characteristic that enables a substance to undergo a chemical change
15. element a substance that is made up of only 1 atom