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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
12
21
Medium

This is a non-metal and it is a structural element of all biomolecules and living beings. Three naturally occurring allotropes of this element are known to exist: amorphous, graphite and diamond.

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6

C

Carbon
1

H

Hydrogen
15

P

Phosphorus
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Carbon
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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