34 Se Selenium 78,971 u

Selenium

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Periyot
4
Grup
16
Blok
p-Blok
Faz (STP)
Solid

Selenium is an essential trace element for humans in small amounts. It is used in glass, electronics, and solar cells.

Görünüm: Black, red, and gray allotropes

About Selenium

Selenium is a nonmetal that occurs in several allotropes—black, red, and gray forms—and carries atomic number 34 with an atomic mass of 78.971. The gray form is a solid with a density of 4.81 g/cm³ that melts at 494 K. Six valence electrons ([Ar] 3d10 4s2 4p4) give an electronegativity of 2.55 and a first ionization energy of 941 kJ/mol. Jöns Jacob Berzelius discovered the element in 1817. An essential trace element for humans in small amounts, selenium is also used in glass, electronics, and solar cells. It belongs to group 16, period 4, in the same family as oxygen and sulfur.

Fiziksel Özellikler

Atom Kütlesi 78.971 u
Yoğunluk 4.809 g/cm³
Erime Noktası 220.9 °C
Kaynama Noktası 684.9 °C
STP'de Faz Solid
Atom Yarıçapı 103.0 pm

Elektronik Özellikler

Elektronegatiflik 2.55
İyonlaşma Enerjisi 941.0 eV
Elektron Afinitesi 195.0 eV
Değer Elektronları 6

Elektron Yapısı

Yapılandırma [Ar] 3d¹⁰ 4s² 4p⁴

Electron Shell Configuration

Selenium electron shell configuration Se 2e⁻ 8e⁻ 18e⁻ 6e⁻
Electron shell structure of Selenium — electrons per shell.
Shell Electrons
1 (K) 2
2 (L) 8
3 (M) 18
4 (N) 6

Position in Periodic Table

Selenium position in the periodic table Se

Keşif

Keşfeden: Jons Jacob Berzelius
Yıl: 1817

Blok ve Periyot

Blok

s p d f

Periyot

1 2 3 4 5 6 7

Periyodik Tablo

Lantanitler Aktinitler

Daha fazla Ametal

1 H Hydrogen 6 C Carbon 7 N Nitrogen 8 O Oxygen 15 P Phosphorus 16 S Sulfur

Frequently Asked Questions

What is Selenium?
Selenium (Se) is a chemical element with atomic number 34. It is a solid at standard temperature and pressure, classified as a ametal.
What are the key properties of Selenium?
Selenium has an atomic mass of 78.971 u, density of 4.809 g/cm³, melting point of 220.9°C, boiling point of 684.9°C.
What is the electron configuration of Selenium?
The electron configuration of Selenium is [Ar] 3d10 4s2 4p4. It is in the p-block of the periodic table.
Who discovered Selenium?
Selenium was discovered by Jons Jacob Berzelius in 1817.
What is the electronegativity of Selenium?
Selenium has an electronegativity of 2.55 on the Pauling scale.