53 I Iodine 126.9 u

Iodine

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周期
5
族
17
ブロック
p-ブロック
相 (STP)
Solid

Iodine is a halogen essential for thyroid function. It sublimes to form a purple vapor and is used as a disinfectant.

About Iodine

Iodine (I) is a halogen essential to human health, required by the thyroid gland to synthesize hormones that regulate metabolism. Element 53 sits in group 17 of period 5 in the p-block, with an atomic mass of 126.9, the electron configuration [Kr] 4d¹⁰ 5s² 5p⁵, and a high Pauling electronegativity of 2.66. Solid at standard conditions, it readily sublimes to a violet vapor, a behavior unusual among the elements. Iodine and its solutions are valued as antiseptics and disinfectants, and it is the heaviest of the common, stable halogens, sitting below chlorine and bromine in the group.

物理的特性

原子質量 126.9 u
STPにおける相 Solid

電子的特性

電気陰性度 2.66

電子配置

配置 [Kr] 4d¹⁰ 5s² 5p⁵

Electron Shell Configuration

Iodine electron shell configuration I 2e⁻ 8e⁻ 18e⁻ 18e⁻ 7e⁻
Electron shell structure of Iodine — electrons per shell.
Shell Electrons
1 (K) 2
2 (L) 8
3 (M) 18
4 (N) 18
5 (O) 7

Position in Periodic Table

Iodine position in the periodic table I

ブロックと周期

ブロック

s p d f

周期

1 2 3 4 5 6 7

周期表

ランタノイド アクチノイド

I を含む反応

Chlorine Displacing Iodine from Potassium Iodide

Cl₂ + 2KI → 2KCl + I₂

Single Replacement

Iodine and Sodium Thiosulfate Titration

I₂ + 2Na₂S₂O₃ → Na₂S₄O₆ + 2NaI

Redox

Hydrogen Peroxide as Oxidizing Agent (Acidic)

H₂O₂ + 2H⁺ + 2I⁻ → I₂ + 2H₂O

Redox

Vitamin C as Reducing Agent

C₆H₈O₆ + I₂ → C₆H₆O₆ + 2HI

Redox

Beta Decay of Iodine-131

¹³¹I → ¹³¹Xe + e⁻ + ν̄ₑ + γ

Nuclear

Compounds Containing Iodine

Potassium Iodide

KI

Periodic Acid

HIO₄

Sodium Periodate

NaIO₄

Potassium Iodate

KIO₃

ハロゲン をもっと見る

9 F Fluorine 17 Cl Chlorine 35 Br Bromine 85 At Astatine

Frequently Asked Questions

What is Iodine?
Iodine (I) is a chemical element with atomic number 53. It is a solid at standard temperature and pressure, classified as a ハロゲン.
What are the key properties of Iodine?
Iodine has an atomic mass of 126.9 u.
What is the electron configuration of Iodine?
The electron configuration of Iodine is [Kr] 4d10 5s2 5p5. It is in the p-block of the periodic table.
What is the electronegativity of Iodine?
Iodine has an electronegativity of 2.66 on the Pauling scale.