34 Se Selenium 78.971 u

Selenium

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आवर्त
4
समूह
16
ब्लॉक
p-ब्लॉक
अवस्था (STP)
Solid

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

दिखावट: 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.

भौतिक गुण

परमाणु द्रव्यमान 78.971 u
घनत्व 4.809 g/cm³
गलनांक 220.9 °C
क्वथनांक 684.9 °C
STP पर अवस्था Solid
परमाणु त्रिज्या 103.0 pm

इलेक्ट्रॉनिक गुण

विद्युतऋणात्मकता 2.55
आयनीकरण ऊर्जा 941.0 eV
इलेक्ट्रॉन आत्मीयता 195.0 eV
संयोजकता इलेक्ट्रॉन 6

इलेक्ट्रॉन विन्यास

विन्यास [Ar] 3d¹⁰ 4s² 4p⁴

Electron Shell Configuration

Selenium electron shell configuration Se 2e⁻ 8e⁻ 18e⁻ 6e⁻

Position in Periodic Table

Selenium position in the periodic table Se

खोज

द्वारा खोजा गया: Jons Jacob Berzelius
वर्ष: 1817

ब्लॉक और आवर्त

ब्लॉक

s p d f

आवर्त

1 2 3 4 5 6 7

आवर्त सारणी

लैंथेनाइड एक्टिनाइड

अधातु में और

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 अधातु.
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.