Across
- 2. substance prepared from killed or weakened pathogens and introduced into a body to produce immunity
- 5. a vertical column of elements in the periodic table; elements in a group share chemical properties
- 8. the ability of a substance to be hammered or beaten into thin sheets
- 9. an element that has properties of both metals and nonmetals. EXAMPLE: Silicon is used in semiconductors(computer chips).
- 12. process that releases energy by breaking down glucose and other food molecules in the presence of oxygen
Down
- 1. single-celled organisms that lack a nucleus; prokaryotes
- 3. elements that are dull, brittle, poor conductors of heat, and electricity. Most are gases and some examples are F, Cl, Br, I, N, C, O, He
- 4. A horizontal row of elements in the periodic table.
- 6. parts per million
- 7. elements found on the Periodic table that are shiny, most are solids, malleable, ductile, and conduct heat or electricity.
- 10. an organelle found in plant and algae cells where photosynthesis occurs
- 11. a chemical substance derivable from a mold or bacterium that kills microorganisms and cures infections