89 Ac Actinium 227,0 u

Actinium

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Chu kỳ
7
Nhóm
—
Khối
f-khối
Pha (STP)
Solid

Actinium is a radioactive element that glows blue in the dark. It is the first element in the actinide series and is used in radiation therapy research.

About Actinium

Actinium opens the actinide series and lends the fourteen elements that follow it their collective name. It carries atomic number 89 and a relative atomic mass of 227.0, and its [Rn] 6d1 7s2 configuration places a single d electron above the radon core in period 7 of the f-block. The Pauling electronegativity is 1.1 and the element is a solid under standard conditions. Its radioactivity is intense enough that samples emit a blue glow in darkness, produced as the emitted radiation excites surrounding air. The same decay behaviour has made actinium a subject of medical research, where short-range alpha emission from the element is being investigated as a way of delivering radiation therapy to targeted tissue while sparing the material around it.

Tính chất vật lý

Khối lượng nguyên tử 227.0 u
Pha ở STP Solid

Tính chất điện tử

Độ âm điện 1.1

Cấu hình electron

Cấu hình [Rn] 6d¹ 7s²

Electron Shell Configuration

Actinium electron shell configuration Ac 2e⁻ 8e⁻ 18e⁻ 32e⁻ 18e⁻ 9e⁻ 2e⁻
Electron shell structure of Actinium — electrons per shell.
Shell Electrons
1 (K) 2
2 (L) 8
3 (M) 18
4 (N) 32
5 (O) 18
6 (P) 9
7 (Q) 2

Position in Periodic Table

Actinium position in the periodic table Ac

Khối & Chu kỳ

Khối

s p d f

Chu kỳ

1 2 3 4 5 6 7

Bảng tuần hoàn

Lanthanide Actinide

Thêm Actinide

90 Th Thorium 91 Pa Protactinium 92 U Uranium 93 Np Neptunium 94 Pu Plutonium 95 Am Americium 96 Cm Curium 97 Bk Berkelium 98 Cf Californium 99 Es Einsteinium

Frequently Asked Questions

What is Actinium?
Actinium (Ac) is a chemical element with atomic number 89. It is a solid at standard temperature and pressure, classified as a actinide.
What are the key properties of Actinium?
Actinium has an atomic mass of 227.0 u.
What is the electron configuration of Actinium?
The electron configuration of Actinium is [Rn] 6d1 7s2. It is in the f-block of the periodic table.
What is the electronegativity of Actinium?
Actinium has an electronegativity of 1.1 on the Pauling scale.