What is an element key

The box containing each element's information is known as the element key. Each key contains an element's name, unique symbol, atomic weight and atomic number. Oxygen, for example, has an atomic number of 8, an atomic weight of 15.996 and a unique symbol, O.

Explanation:

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on passing the small ampere of electric current through the tube made of ar and hg of cfl generates uv rays which excites the fluorescent and thus emits the high radiation by consumption of just 5- 12 w in comparison to incandescent light which requires more power such as around 40 - 55 w to lighten.

moreover the life span of fluorescent or cfl is around 8000 h whereas the life span of incandescent is around 1200 h

hence, the building installed with incandescent lights bears more electricity bill.