Games
3
20
Easy

What Element has the Atomic Number 21?

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21

Sc

Scandium
60

Zn

Neodymium
61

Pm

Promethium
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Scandium
11
21
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

Ar

Argon
6

C

Carbon
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Hydrogen
17
20
Hard

This element is classified as an actinide and it is solid at room temperature. It is a synthetic transuranic element and can be produced in kilogram quantities. It is used in smoke detectors and as a portable source of gamma rays.

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95

Am

Americium
103

Ac

Lawrencium
92

U

Uranium
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Americium

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