CHEMISTRY

3. electron an electron that is associated with an atom;located on the outer most shell of the atom
5. a chemical substance that neutralizes alkali's, dissolves some metals
8. the first element to be created
9. number the number of protons in the nucleus of an atom ,determines chemical property and place on the periodic table
11. model a graphic representation of an atom
12. a subatomic particle with no charge
13. an element whose properties are intermediate between those of metals and solid non-metals
15. the process of burning something
17. the ability to do work
18. a subatomic particle with a negative charge
19. a form of energy that flows between matter due to difference in temperature

1. an atom or molecule with a net electric charge due to loss or gain of one or more electrons
2. metals a group of univalent metals including sodium,lithium,potassium,etc..
4. reaction a process that involves rearrangement of a structure
6. two or more elements chemically combined in a set ratio
7. a subatomic particle with a positive charge;found in the nucleus of an atom
10. A branch of physical science that studies the composition,structure,properties,change of matter
14. the smallest part of matter
16. two or more atoms combined
17. pure substance that cannot be broken down into another substance by physical or chemical means