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صفحة: 32
7 . Students experimented with several elements in the laboratory . When they struck one of the elements with a hammer , it crumbled . Which area of the periodic table is this element located in ? Explain . 8 . The element chlorine is a toxic and highly chemically active element . Which of the following elements has similar properties ? Explain . A . Carbon B . Boron C . Argon D . Fluorine 9 . The filament in an incandescent light bulb is made of a metal named tungsten . The body of the bulb is filled with the noble gas argon , rather than with air . Explain why . 10 . Copy the following diagram into your notebook , and fill in the following terms : non-metals , alkali metals , halogens , metals , elements , noble gases
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