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15
20
Medium

This is a halogen element, lustrous solid, which volatilizing at ordinary temperatures into a blue-violet gas with an irritating odor. Ample amounts of this element are required by the human body for the proper function of the thyroid gland.

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53

I

Iodine
35

F

Bromine
85

At

Astatine
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Iodine
14
21
Medium

This element is the lightest alkali metal and it is very reactive. This metal is used for the production of dry cells and storage batteries (for cell phones, car batteries, etc.). The carbonate of this metal is used for the treatment of some mental decease.

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3

Li

Lithium
55

Cs

Caesium
87

Fr

Francium
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Lithium
18
20
Hard

This element is a noble gas which is gas at room temperature. It is characterized by its brilliant green and orange spectral lines. This noble gas is used in fluorescent light bulbs, luminous signs, high-speed photography.

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36

Kr

Krypton
54

Og

Xenon
86

Rn

Radon
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Krypton

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