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Indium (In) – Element 49 of the periodic table

Indium (symbol In) is element number 49 of the periodic table and belongs to the “Metal” category. Its atomic mass is about 114.82, and its phase under standard conditions is Solid. This element sits in period 5 and group 13 of the periodic table, and its electrons are arranged in shells of 2, 8, 18, 18, 3. The short electron configuration of Indium is [Kr] 4d¹⁰ 5s² 5p¹. Known uses of Indium include Touch panels, Solder alloys and Transparent coatings.

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Properties of Indium

Atomic number
49
Chemical symbol
In
Atomic mass
114.82
Category
Metal
Period
5
Group
13
Phase
Solid
Protons
49
Electrons
49
Neutrons (approx.)
66
Electron shells
2, 8, 18, 18, 3
Outer-shell electrons
3
Discovered
Ferdinand Reich (1863)

Electron configuration of Indium

The electron configuration of Indium (In), with 49 electrons, is shown below. The last shell (shell 5) is highlighted:

Full configuration
1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p¹
Short configuration
[Kr] 4d¹⁰ 5s² 5p¹
Last shell
5s² 5p¹

What is electron configuration and how is it written?

Electron shells of Indium

Distribution of 49 electrons of Indium across shells K to O:

  1. K2
  2. L8
  3. M18
  4. N18
  5. O3

What is a metal?

The p-block metals (the post-transition metals) are usually softer than the transition metals and have lower melting points.

Uses of Indium

Frequently asked questions about Indium

What is the atomic number of Indium?

The atomic number of Indium (In) is 49; that is, every atom of it has 49 protons.

What is the electron configuration of Indium?

The electron configuration of Indium (In) is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹⁰ 4s² 4p⁶ 4d¹⁰ 5s² 5p¹; in short form it is [Kr] 4d¹⁰ 5s² 5p¹, and its last shell is 5s² 5p¹.

What is the chemical symbol of Indium?

The chemical symbol of Indium is In.

Where is Indium located in the periodic table?

Indium is located in period 5 and group 13 and belongs to the “Metal” category.

What is the atomic mass of Indium?

The atomic mass of Indium is about 114.82 (atomic mass units).

What is the phase of Indium under normal conditions?

The phase of Indium under standard conditions is Solid.

What are the uses of Indium?

Uses of Indium include Touch panels, Solder alloys and Transparent coatings.

Who discovered Indium?

Indium was discovered by Ferdinand Reich in 1863.

Elements in the same category as Indium (Metal)

Aluminum (Al)Gallium (Ga)Tin (Sn)Thallium (Tl)Lead (Pb)Bismuth (Bi)Polonium (Po)Nihonium (Nh)Flerovium (Fl)Moscovium (Mc)Livermorium (Lv)

See all Post-transition metals

Indium’s group 13 neighbours

Boron (B)Aluminum (Al)Gallium (Ga)Thallium (Tl)Nihonium (Nh)

Group 13 of the periodic table