87 Fr 프랑슘 223.0 u

프랑슘

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주기
7
족
1
블록
s-블록
상 (표준 상태)
Solid

프랑슘은 처음 101개 원소 가운데 가장 불안정하다. 자연에 극히 드물어 지각에 많아야 30그램 정도만 존재한다.

프랑슘 개요

Of the first 101 elements, none is more unstable than francium. Its nuclei decay so quickly that no more than about 30 grams are present in the crust at any moment, sustained entirely by the decay of heavier actinides. The element holds atomic number 87 and a relative atomic mass of 223.0, and the single valence electron of its [Rn] 7s1 configuration makes it the heaviest alkali metal in group 1 of period 7. Its Pauling electronegativity of 0.7 is the lowest assigned to any element, a direct consequence of how weakly that outermost s electron is held. Francium is a solid at standard conditions, though bulk samples have never been isolated in a quantity sufficient to examine directly.

물리적 성질

원자 질량 223.0 u
표준 상태에서의 상 Solid

전자적 성질

전기 음성도 0.7

전자 배치

배치 [Rn] 7s¹

전자껍질 배치

프랑슘의 전자껍질 배치 Fr 2e⁻ 8e⁻ 18e⁻ 32e⁻ 18e⁻ 8e⁻ 1e⁻
프랑슘의 전자껍질 구조 — 껍질별 전자 수.
껍질 전자
1 (K) 2
2 (L) 8
3 (M) 18
4 (N) 32
5 (O) 18
6 (P) 8
7 (Q) 1

주기율표에서의 위치

주기율표에서 프랑슘의 위치 Fr

블록 & 주기

블록

s p d f

주기

1 2 3 4 5 6 7

주기율표

란타넘족 악티늄족

더 많은 알칼리 금속

3 Li 리튬 11 Na 나트륨 19 K 칼륨 37 Rb 루비듐 55 Cs 세슘

Frequently Asked Questions

What is 프랑슘?
프랑슘 (Fr) is a chemical element with atomic number 87. It is a solid at standard temperature and pressure, classified as a 알칼리 금속.
What are the key properties of 프랑슘?
프랑슘 has an atomic mass of 223.0 u.
What is the electron configuration of 프랑슘?
The electron configuration of 프랑슘 is [Rn] 7s1. It is in the s-block of the periodic table.
What is the electronegativity of 프랑슘?
프랑슘 has an electronegativity of 0.7 on the Pauling scale.