Periodic Table

1. a positively charged subatomic particle in the nucleus of an atom
5. a region in an atom where there is a high probability of finding electrons
6. an ion with a positive chage
7. the total number of protons and neutrons in the nucleus of an atom
11. symbol for atomic mass unit
12. an atom or a group of atoms that has lost or gained one or more electrons and therefore has a net electric charge
13. the process of adding electrons to or removing electrons from an atom or group of atoms
14. a neutral subatomic particle in the nucleus of an atom
16. any of the possible energies an electron may have in an atom
19. an ion with a negative charge
20. the smallest particle that has the properties of an element

2. the center of an atom; made up of protons and neutrons
3. any atoms having the same number of protons but a different number of neutrons
4. the elements that are good conductors of heat and electricity
8. the number of protons in the nucleus of an atom
9. the properties of elements tend to repeat in a regular pattern when elements are arranged in order of increasing atomic number
10. electron an electron in the outermost energy level of an atom
15. a horizontal row of elements in the periodic table
17. a negatively charged subatomic particle found in the energy level of an atom
18. a vertical column of elements in the periodic table