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13
20
Medium

This element is a transition metal used in large amounts by the electrical industry in the form of wire. This metal is the second-best in the electrical conductance. Because this element resists corrosion in air, moisture and seawater, it has been widely used in coins.

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29

Cu

Copper
26

Ag

Iron
80

Hg

Mercury
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Copper
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
16
20
Hard

This element and its compounds are poisonous and they are used for the production of rat poison and insecticides. It is a metalloid. Small amounts of this element are added to germanium to make transistors.

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33

As

Arsenic
110

I

Darmstadtium
60

Nd

Neodymium
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Arsenic

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