Periodic Table

1. card to see definition
5. / an ion with a negative charge
7. / the horizontal rows on the periodic table
8. / any atoms having the same number of protons but a different number of neutrons
11. / a neutral subatomic particle in the nucleus of an atom
14. electron / an electron in the outermost energy level of an atom
16. / the process of adding electrons to or removing electrons from an atom or group of atoms
18. law / the properties of elements tend to repeat in a regular pattern when elements are arranged in order of increasing atomic number
19. level / any of the possible energies an electron may have in an atom
20. number / the total number of protons and neutrons in the nucleus of an atom

2. / an atom or a group of atoms that has lost or gained one or more electrons and therefore has a net electric charge
3. / an ion with a positive charge
4. process of adding electrons to or removing electrons from an atom or group of atoms
6. mass unit / a quantity equal to one-twelfth the mass of a carbon-12 atom
7. / a positively charged subatomic particle in the nucleus of an atom
9. / a region in an atom where there is a high probability of finding electrons
10. / the columns on the periodic table
12. / a negatively charged subatomic particle found in the energy level of an atom
13. atom or a group of atoms that has lost or gained one or more electrons and therefore has a net electric charge
15. / the smallest particle that has the properties of an element
17. / the center of an atom; made up of protons and neutrons
21. / symbol for atomic mass unit