2. The use of ________________ in chemistry saved chemists time.

3. Most substances are made from two or more elements that are joined together,

    They are called ________________.

5. Compound of some elements are used to make ______________

6. Sodium and chlorine form a __________________ compound.

7. A process in which one substance spreads out trhough another.

8. At the top of very high mountains the atmospheric pressure is less than at sea level.

9. The first twenty elements of the periodic table begins with hydrogen

    and ends with ___________________.

10. The first chemists were called _________________.

1.In 1813 _____________________ introduced the symbols to represent the

     elements

Where are the nonmetals located on the periodic table?