34 Se Selenium 78,971 u

Selenium

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Período
4
Grupo
16
Bloco
p-bloco
Fase (STP)
Solid

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

Aparência: 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.

Propriedades físicas

Massa atômica 78.971 u
Densidade 4.809 g/cm³
Ponto de fusão 220.9 °C
Ponto de ebulição 684.9 °C
Fase em STP Solid
Raio atômico 103.0 pm

Propriedades eletrônicas

Eletronegatividade 2.55
Energia de ionização 941.0 eV
Afinidade eletrônica 195.0 eV
Elétrons de valência 6

Configuração eletrônica

Configuração [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

Descoberta

Descoberto por: Jons Jacob Berzelius
Ano: 1817

Bloco e período

Bloco

s p d f

Período

1 2 3 4 5 6 7

Tabela Periódica

Lantanídeos Actinídeos

Mais Não Metal

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 não metal.
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.