Atomic Number: 20
Atomic Symbol: Na
Atomic Weight: 40.08
Boiling Point: 1484 C
Melting Point: 842 C
The discovery of calcium dates back to the year 1808. It is an impure metal when discovered and is pretty hard. Calcium is a silvery color and is a metallic element. The element is the 5th most abundant in the earth’s crust.

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1665 – 1825
Between 1665 and 1680, Flemish Jesuit priest and astronomer Ferdinand Verbiest created plans for a miniature four-wheel unmanned steam “car” for Chinese Emperor Khang Hsi. In 1769, Frenchman Nicholas Cugnot built a steam-powered motor carriage capable of six miles per hour. In 1825, British inventor Goldsworthy Gurney built a steam car that successfully […]

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Atomic Number: 17
Atomic Symbol: Cl
Atomic Weight: 35.453
Boiling Point: -34.4 C
Melting Point: -101.5 C
Chlorine is only found naturally in nature as a compound: Sodium Chloride, or table salt. It was discovered in 1774 and was given its name in 1810 by a scientist known as Davy, who insisted it was an element.

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