Across
- 3. About three fourths of the elements are what?
- 6. petroleum is a complex mixture of () what?
- 7. We call the mendeleyev’s table the periodic table after the periodic changes found in element ( ).
- 8. a formula contains numbers below the elements called what?
Down
- 1. the subscripts in chemical formulas tell us the ( ) of particles that combine in a compound.
- 2. The basic building block of all matter are…
- 4. compounds can only be broken apart by…
- 5. the number of ( ) in an atom determines what element it is.