34 Se 셀레늄 78.971 u

셀레늄

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주기
4
족
16
블록
p-블록
상 (표준 상태)
Solid

셀레늄은 소량이 인체에 필수적인 미량 원소이다. 유리, 전자제품, 태양전지에 쓰인다.

외관: 검은색, 빨간색, 회색 동소체

셀레늄 개요

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.

물리적 성질

원자 질량 78.971 u
밀도 4.809 g/cm³
녹는점 220.9 °C
끓는점 684.9 °C
표준 상태에서의 상 Solid
원자 반지름 103.0 pm

전자적 성질

전기 음성도 2.55
이온화 에너지 941.0 eV
전자 친화도 195.0 eV
원자가 전자 6

전자 배치

배치 [Ar] 3d¹⁰ 4s² 4p⁴

전자껍질 배치

셀레늄의 전자껍질 배치 Se 2e⁻ 8e⁻ 18e⁻ 6e⁻
셀레늄의 전자껍질 구조 — 껍질별 전자 수.
껍질 전자
1 (K) 2
2 (L) 8
3 (M) 18
4 (N) 6

주기율표에서의 위치

주기율표에서 셀레늄의 위치 Se

발견

발견자: Jons Jacob Berzelius
연도: 1817

블록 & 주기

블록

s p d f

주기

1 2 3 4 5 6 7

주기율표

란타넘족 악티늄족

더 많은 비금속

1 H 수소 6 C 탄소 7 N 질소 8 O 산소 15 P 인 16 S 황

Frequently Asked Questions

What is 셀레늄?
셀레늄 (Se) is a chemical element with atomic number 34. It is a solid at standard temperature and pressure, classified as a 비금속.
What are the key properties of 셀레늄?
셀레늄 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 셀레늄?
The electron configuration of 셀레늄 is [Ar] 3d10 4s2 4p4. It is in the p-block of the periodic table.
Who discovered 셀레늄?
셀레늄 was discovered by Jons Jacob Berzelius in 1817.
What is the electronegativity of 셀레늄?
셀레늄 has an electronegativity of 2.55 on the Pauling scale.