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Molecular formula

I2

4 compounds have this formula on CompoundList.

Molar mass
253.80g/mol
Monoisotopic mass
261.8122Da
Atoms
2
Elements
1

The formula I2 describes a molecule made of 2 iodine atoms. It is written in Hill notation: with no carbon present, every element is listed in alphabetical order. The formula tells you which atoms are present, not how they are connected, which is why several different chemicals can share it.

Elemental composition

  • I Iodine × 2100.00%
    126.9 × 2 = 253.800 g/mol
Look up another formula

Compounds with the formula I2

Isomers we list, best known first. Open one to see its structure, properties, safety data and suppliers.

Showing 1 to 4 of 4 compounds

Iodine chemical structure, I2, CAS 7553-56-2
Iodine
CAS 7553-56-2I2
Iodine I-123 chemical structure, I2, CAS 2052213-29-1
Iodine I-123
CAS 2052213-29-1I2
Iodine I-131 chemical structure, I2, CAS 15124-39-7
Iodine I-131
CAS 15124-39-7I2
Iodine I-129 chemical structure, I2, CAS 29972-72-3
Iodine I-129
CAS 29972-72-3I2

Frequently asked questions

What is the molar mass of I2?

The molar mass of I2 is 253.80 g/mol, calculated from standard atomic weights for 2 iodine atoms. The monoisotopic mass is 261.8122 Da.

How many compounds have the formula I2?

CompoundList lists 4 compounds with the molecular formula I2, including Iodine, Iodine I-123, Iodine I-131. Compounds that share a formula are isomers. They contain the same atoms arranged differently, so their properties, uses and prices can be very different.