Across
- 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
Down
- 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