Crossword Puzzle Across: 1 3 5 6 8 11 12 13 This mineral is the chief ore of lead. NiCd rechargeable batteries are commonly used in consumer portable products. This is one of the elements used in the manufacture of this type of batteries. This material is used as a coating on cooking utensils and in industrial applications to prevent sticking. It is a very unreactive plastic consisting of long chains of carbon-fluorine units. A mineral containing calcium where significant quantities of the important element fluorine can be obtained. It is used in the production of glass and enamel. Most of this element is a man-made element from a nuclear reactor. One form of this element was an important ingredient in the development and production of the first atomic bombs because when the atom of this element splits apart, it generates a tremendous amount of energy. One kilogram of this substance, Pu-239, can produce sufficient heat to generate nearly 10 million kilowatt-hours of electricity, sufficient for over 1000 households. Water is made up of this element. It is also in the air that we breathe. (Two words) This sulfur containing compound is an environmental pollutant. The presence of this pollutant contributes to the problem known as acid rain. This is the lightest element on the periodic table. This gas is makes up the fuel for the Sun to burn. The Sun uses about four MILLION TONS of this gas 14 15 17 18 20 21 22 23 every SECOND! Brass is an alloy of this element and copper. Pierre and Marie Curie were the pioneers of the field of radioactivity. This element was named after them. ALCAN is the manufacturer of this element. The BC smelter is located in Kitimat. The purity of gold is measured in this unit. (Two words) This is the gas that you breathe out. Too much of this gas in the atmosphere will result in global warming. Potassium salts are given this name. Canada produces about 25% of the world production of potassium salts from deposits in the Prairie Evaporite Formation in Saskatchewan. A compound of this element is the active ingredient in Pepto-Bismol. This is the compound that forms when iron corrodes. DOWN: 1 2 3 4 7 9 10 16 19 The symbol of this element is Au. It comes from its Latin name aurum. Inco Ltd is a producer of this element. Their Ontario's Sudbury Basin has some of the richest mineral deposits in the world and expanding operations in Manitoba. It's CFC for short. These compounds are used as air-conditioner refrigerants and aerosal propellants. When these compounds reach the stratosphere, they break down the ozone layer. The chemical symbol of this element is taken from the Latin, hydrargyrus, meaning "liquid silver". It is the only metal that is in its liquid state at room temperature. This element is the active ingredient in fertilizer, which is essential for plant growth. Laughing gas, which is a mild anaesthetic used in medicine and dentistry also contains this element. This is the most abundant solid element. You'd recognize the compound of this element as sand on the beach. There is a center of high technology known by its name, near San Francisco in California, where semiconductor chips are the principal product made from this element. This is a light gas. When it is used to fill weather balloon or birthday balloon, the balloon will rise because it is less dense than air. Striking these will generate enough heat of friction to ignite the phosphorus sulfide. When electricity is passed through this gaseous element, the gas glows. The most popularly known commercial application is making tubes filled with this glowing gas for advertisement.