Across
- 3. are atoms that have different numbers of neutrons to stabilize an atom
- 8. elements in the lanthanides and actinides
- 11. elements made in small quantities by humans and are unstable
- 13. elements in group 2 and combine readily with other elements, their ion is 2+
- 15. elements that are in group 17 and are the most reactive nonmetals because of their 1- charge for ions
Down
- 1. vertical columns on the periodic table
- 2. elements on the stair step that have both metallic and nonmetallic properties
- 4. atoms want this, it is an empty outer shell or completely full shell with 8 electrons
- 5. an atom of an element that has fewer or more electrons than protons
- 6. elements that are solids at room temperature, good conductors of electricity and heat, have luster (are shiny), are ductile and malleable
- 7. elements in groups 3-12 and occur in nature uncombined
- 9. elements that are in group 18 and exist as isolated atoms because they are EXTREMELY stable because their outer electron shell (valence) is full
- 10. horizontal rows on the periodic table
- 12. elements that are gasses at room temperature and are poor conductors of heat and electricity
- 14. elements in group 1 that are extremely reactive andtheirt occur in nature uncombined, there ion is 1+