1. How many natural elements are there?   88   92   103   113   Hint Half-n-half Clue   2. Which of the following is an element?   Air   Aluminum   Water   Salt   Half-n-half Clue   3. Of the three states of matter, which one has neither definite volume nor definite shape?   Gas   Solid   Liquid   Air   Half-n-half Clue   4. _______ is the lightest element.   Lithium   Neon   Hydrogen   Helium   Half-n-half Clue   5. Of the three states of matter, which one has definite volume but no definite shape?   Solid   Water   Liquid   Gas   Half-n-half Clue   6. _______ is the heaviest natural element.   Radium   Lead   Mercury   Uranium   Half-n-half Clue   7. Which of the following occurs during evaporation?   Molecules escape from the liquid surface.   Molecules escape from the liquid bulk.   Steam and oxygen escape from the liquid bulk.   Steam and oxygen escape from the liquid surface.   Half-n-half Clue