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11
20
Medium

This is a non-metal and the most abundant element in the Universe. It is the basic fuel for nuclear reactions in the stars. It is a gaseous substance on Earth and the lightest element in the Universe.

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1

H

Hydrogen
18

N

Argon
6

C

Carbon
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Hydrogen
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
19
20
Hard

This is a transition metal. This is a metal of the platinum family and it is the most corrosion-resistant metal known. It is used in the production of the alloys with osmium and platinum and in the production of crucibles and devices requiring high temperatures.

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77

Ir

Iridium
26

Zn

Iron
22

Ti

Titanium
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Iridium

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