Is iodine a solid or a liquid? Why does iodine sublime instead of melting first?

Iodine exists in nature in a water-soluble form. It is rare in nature. Except for the high content in seawater, kelp, marine fish, shellfish and other animals and plants, the content in most soils, rocks and water is very low. Iodine is one of the essential trace elements for the human body. The following is a brief introduction to iodine, I hope it is useful.

Contents of this article

1. Is iodine a solid or a liquid?

2. Why does iodine sublime instead of melting first?

3. Harms of iodine deficiency

Is iodine a solid or liquid?

Iodine is solid and easy to sublimate. It has no liquid under normal pressure. Iodine can be directly transformed into gas without passing through the liquid state. After sublimation, iodine is easy to condense and is toxic and corrosive. Iodine is a non-metallic element. Elemental iodine was first discovered by French pharmacist Courtois in 1811.

Elemental iodine is a purple-black crystal that turns blue-purple when it comes into contact with starch. It is mainly used in the manufacture of drugs, dyes, iodine tincture, test papers and iodine compounds.

Iodine exists in nature in a water-soluble form and is rare in nature. Plants and animals such as kelp, marine fish, and shellfish contain higher amounts of iodine.

Methods for preparing iodine: Iodine can be extracted from seaweed, oil well brine and mother liquor from saltpeter production. Iodine is one of the essential trace elements for the human body.

Why does iodine sublime instead of melting first?

Because iodine sublimates at about 45°C, and the melting point of iodine is about 113°C, it sublimates before reaching the melting point. Elemental iodine is purple-black crystals, easy to sublimate, easy to condense after sublimation, and toxic and corrosive. Elemental iodine will turn blue-purple when it meets starch. It is mainly used to make drugs, dyes, iodine tincture, test paper and iodine compounds.

Iodine exists in nature in a water-soluble form. It is rare in nature. Except for the high content in seawater, kelp, marine fish, shellfish and other animals and plants, the content in most soils, rocks and water is very low.

Iodine is rare in nature, ranking 47th in the earth's crust. Except for its high content in seawater (50-60 micrograms per liter of seawater), its content in most soils, rocks, and water is very low.

Iodine has a high vapor pressure and sublimates under slight heat. Pure iodine vapor is dark blue, and if it contains air it is purple-red and has a pungent odor.

The dangers of iodine deficiency

Dangers of iodine deficiency in early pregnancy

In the early stages of pregnancy, the fetus' brain is developing rapidly, and the nutrition needed by the fetus at this time is completely supplemented by the expectant mother. Iodine deficiency in the early stages of pregnancy will cause iodine deficiency in the fetus, which will affect the proliferation and differentiation of nerve cells and the synthesis of brain proteins. The reduction in brain protein content will reduce cell volume and brain weight, which will directly affect the intellectual development of the fetus.

The harm of iodine deficiency in the second and third trimesters of pregnancy

In the middle and late stages of pregnancy, as the fetus grows and develops, the demand for iodine increases. If the expectant mother cannot supplement enough iodine at this time, the synthesis and secretion of fetal thyroid hormone will be reduced, which may lead to hypothyroidism in the newborn, and even premature birth and fetal death.