34 Se Selenium 78.971 u

Selenium

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周期
4
族
16
区块
p-区块
相态 (STP)
Solid

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

外观: 红棕色固体

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.

物理属性

原子质量 78.971 u
密度 4.809 g/cm³
熔点 220.9 °C
沸点 684.9 °C
STP相态 Solid
原子半径 103.0 pm

电子属性

电负性 2.55
电离能 941.0 eV
电子亲和能 195.0 eV
价电子 6

电子构型

构型 [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

发现

发现者: Jons Jacob Berzelius
年份: 1817

区块与周期

区块

s p d f

周期

1 2 3 4 5 6 7

元素周期表

镧系元素 锕系元素

更多非金属

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 非金属.
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.