88 Ra 라듐 226.0 u

라듐

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주기
7
족
2
블록
s-블록
상 (표준 상태)
Solid

라듐은 마리와 피에르 퀴리가 발견한 방사성 알칼리 토금속이다. 강한 방사능 때문에 옅은 푸른빛을 낸다.

라듐 개요

The isolation of radium by Marie and Pierre Curie gave radioactivity its first widely recognised chemical subject. The element occupies atomic number 88 with a relative atomic mass of 226.0, and its [Rn] 7s2 configuration places it in group 2 of period 7 as the heaviest alkaline earth metal. Its electronegativity is 0.9 and it is a solid at standard temperature and pressure. Radioactivity in radium is intense enough to excite the surrounding air and the compound matrix, which is why preparations of the element glow with a faint blue light without any external stimulus. That luminescence, once exploited commercially in self-luminous paints, is now understood as a direct visual signature of the ionising radiation that makes the element hazardous to handle.

물리적 성질

원자 질량 226.0 u
표준 상태에서의 상 Solid

전자적 성질

전기 음성도 0.9

전자 배치

배치 [Rn] 7s²

전자껍질 배치

라듐의 전자껍질 배치 Ra 2e⁻ 8e⁻ 18e⁻ 32e⁻ 18e⁻ 8e⁻ 2e⁻
라듐의 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) 2

주기율표에서의 위치

주기율표에서 라듐의 위치 Ra

블록 & 주기

블록

s p d f

주기

1 2 3 4 5 6 7

주기율표

란타넘족 악티늄족

Ra가 포함된 반응

라듐-226의 알파 붕괴

²²⁶Ra → ²²²Rn + ⁴He

핵

토륨-232의 알파 붕괴

²³²Th → ²²⁸Ra + ⁴He

핵

더 많은 알칼리 토금속

4 Be 베릴륨 12 Mg 마그네슘 20 Ca 칼슘 38 Sr 스트론튬 56 Ba 바륨

Frequently Asked Questions

What is 라듐?
라듐 (Ra) is a chemical element with atomic number 88. It is a solid at standard temperature and pressure, classified as a 알칼리 토금속.
What are the key properties of 라듐?
라듐 has an atomic mass of 226.0 u.
What is the electron configuration of 라듐?
The electron configuration of 라듐 is [Rn] 7s2. It is in the s-block of the periodic table.
What is the electronegativity of 라듐?
라듐 has an electronegativity of 0.9 on the Pauling scale.