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Strontium (Sr) – Element 38 of the periodic table

Strontium (symbol Sr) is element number 38 of the periodic table and belongs to the “Alkaline earth metal” category. Its atomic mass is about 87.62, and its phase under standard conditions is Solid. This element sits in period 5 and group 2 of the periodic table, and its electrons are arranged in shells of 2, 8, 18, 8, 2. The short electron configuration of Strontium is [Kr] 5s². Known uses of Strontium include Fireworks, Glassmaking and Dentistry.

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Properties of Strontium

Atomic number
38
Chemical symbol
Sr
Atomic mass
87.62
Category
Alkaline earth metal
Period
5
Group
2
Phase
Solid
Protons
38
Electrons
38
Neutrons (approx.)
50
Electron shells
2, 8, 18, 8, 2
Outer-shell electrons
2
Discovered
Adair Crawford (1790)

Electron configuration of Strontium

The electron configuration of Strontium (Sr), with 38 electrons, is shown below. The last shell (shell 5) is highlighted:

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

What is electron configuration and how is it written?

Electron shells of Strontium

Distribution of 38 electrons of Strontium across shells K to O:

  1. K2
  2. L8
  3. M18
  4. N8
  5. O2

What is a alkaline earth metal?

The alkaline earth metals are the group 2 elements: reactive metals, harder than the alkali metals and with higher melting points, that usually form ions with a +2 charge.

Uses of Strontium

Frequently asked questions about Strontium

What is the atomic number of Strontium?

The atomic number of Strontium (Sr) is 38; that is, every atom of it has 38 protons.

What is the electron configuration of Strontium?

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

What is the chemical symbol of Strontium?

The chemical symbol of Strontium is Sr.

Where is Strontium located in the periodic table?

Strontium is located in period 5 and group 2 and belongs to the “Alkaline earth metal” category.

What is the atomic mass of Strontium?

The atomic mass of Strontium is about 87.62 (atomic mass units).

What is the phase of Strontium under normal conditions?

The phase of Strontium under standard conditions is Solid.

What are the uses of Strontium?

Uses of Strontium include Fireworks, Glassmaking and Dentistry.

Who discovered Strontium?

Strontium was discovered by Adair Crawford in 1790.

Elements in the same category as Strontium (Alkaline earth metal)

Beryllium (Be)Magnesium (Mg)Calcium (Ca)Barium (Ba)Radium (Ra)

See all Alkaline earth metals

Strontium’s group 2 neighbours

Beryllium (Be)Magnesium (Mg)Calcium (Ca)Barium (Ba)Radium (Ra)

Group 2 of the periodic table