Across
- 2. Positively charged subatomic particles.
- 4. Negatively charged subatomic particles.
- 5. An element or substance that is not a metal.
- 8. Metallic elements in group 2 of the periodic table which are harder than the alkali metals and are also less reactive.
- 10. Vertical column on the periodic table.
- 11. Horizontal rows on the periodic table.
- 14. Electrons in the outermost shell of an atom.
- 16. Contains Nonmetals, 7 valence electrons in its outermost energy level. Very reactive.
- 19. The number of protons and electrons in the nucleus of an atom.
- 20. Group 1. 1 electron in outer level, very reactive.
- 21. Particles of the nucleus that have no charge.
- 22. Elements in group 18 of the periodic table that are chemically stable.
Down
- 1. Group 3 metals on the periodic table.
- 3. a region around the nucleus of an atom where electrons are found.
- 6. Atoms of the same element that have different numbers of neutrons.
- 7. The sum of the number of neutrons and protons in an atomic nucleus.
- 9. the weighted average of the atomic masses of the naturally occurring isotopes of an element.
- 12. Energy levels where the electrons are found.
- 13. Elements that are good conductors of electric current and heat.
- 15. Elements that form a bridge between elements on the left and right sides of the periodic table Groups 3-12.
- 17. Center of an atom
- 18. Elements with properties that fall between those of metals and nonmetals.
- 19. Smallest particle of an element that still has the properties of that element.