Across
- 2. Vertical column in the periodic table
- 3. A combination of chemical symbols and numbers to represent a substance
- 8. the number of electrons in the outermost energy level
- 13. A table that classifies elements by their physical and chemical properties; rows are called periods; columns are called groups
- 14. horizontal line on the periodic table
- 15. A molecule composed of one kind of atom; cannot be broken into simpler units by chemical reactions
- 16. molecules that contains more than one element
Down
- 1. elements that are usually dull in appearance, poor conductors of heat and electricity, gases at room temperature
- 4. metallic elements in group 2 of the periodic table which are harder than the alkali metals and are also less reactive
- 5. makes up most of the periodic table
- 6. elements with properties that fall between those of metals and nonmetals
- 7. groups of two or more elements bound by chemicals
- 9. Group 1, 1 electron in outer level, very reactive, soft, silver, shiny, low density; Lithium, Sodium, Potassium, Rubidium, Cesium, Francium
- 10. have a full outer s and p sub-shells of 8 electrons and, therefore, are stable and tend not to form ions
- 11. A number written slightly below and to the right of a chemical symbol that shows how many atoms of an element are in a compound
- 12. Group 17 Contains nonmetals, 7 valence electrons in it's outermost energy level. Very reactive