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Metals, alloys and elements

Protactinium-231

Also known as 231Pa radioisotope, Pa-231 radioisotope, (~231~Pa)Protactinium

CAS 14331-85-2Formula PaMolar mass 231.04 g/mol
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Element with atomic number and standard atomic weight

Key facts

What buyers check first

All properties
CAS number
14331-85-2
Formula
Pa
Molar mass
231.04 g/mol
HS code
284443
Category
Metals, alloys and elements

What is Protactinium-231?

Plain description, key identifiers and synonyms

Protactinium-231 is a chemical substance with the molecular formula Pa and a molar mass of 231.04 g/mol. Its CAS registry number is 14331-85-2.

Identifiers

Registry numbers, names and line notations, tap to copy

IUPAC name
protactinium-231
CAS number
14331-85-2 CAS number cross-checked
Molecular formula
Pa
InChIKey
XLROVYAPLOFLNU-IGMARMGPSA-N
InChI
InChI=1S/Pa/i1+0
Canonical SMILES
[Pa]
Isomeric SMILES
[231Pa]

Synonyms

  • 231Pa radioisotope
  • Pa-231 radioisotope
  • (~231~Pa)Protactinium
  • 231Pa
  • Protactinium, isotope of mass 231

Physical and chemical properties

Measured values and descriptors computed from the structure

Physical and chemical properties

Measured values, check the supplier specification for your grade

No measured properties are recorded for this substance yet. Ask suppliers for a technical data sheet.

Values vary by grade. Ask suppliers for the COA or TDS of the batch you buy.

Computed descriptors

Calculated from the structure, useful for screening and formulation

Molecular weight
231.04 g/molcalc.
Exact mass
231.0359 Dacalc.
LogP (octanol/water)
0calc.
Topological polar surface area
0 Ųcalc.
Hydrogen bond donors
0calc.
Hydrogen bond acceptors
0calc.
Rotatable bonds
0calc.
Heavy atoms
1calc.
Rings
0calc.
Aromatic rings
0calc.
Fraction sp3 carbons
0calc.
Formal charge
0calc.
Stereocentres
0calc.

Calculated for screening. Confirm critical figures with the supplier.

Safety and hazards

GHS classification summary, not a safety data sheet

No GHS hazard classification is recorded for this substance yet. That does not mean it is harmless.

GHS classification summary, not a safety data sheet (SDS). Classifications can differ by supplier, grade and concentration. Always check the supplier's SDS.

Protactinium-231 suppliers

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Protactinium-231 price

Indicative price range per kg from live supplier offers

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Uses and applications

What the substance is used for, by industry and function

Regulatory status

Inventories, regulations and trade controls that list this substance

No regulatory list memberships are recorded for this substance yet. Always check the rules of the importing and exporting country before trade.

HS code and trade data

Customs classification and reported world trade statistics

Global trade

World import and export statistics for the HS code Protactinium-231 is traded under.

HS 2844.43Indicative HS code

Radioactive elements and isotopes and compounds other than those of subheading 284410…

World exports in 2024
$2.19B
+8.8% vs 2023, imports $2.53B
2022 to 2024
Top exporters
  1. Canada32.1%
  2. Netherlands17.0%
  3. Germany11.4%
Top importers
  1. United States37.8%
  2. Germany8.4%
  3. China5.8%
Reported customs values in USD, not prices.Full trade data

The HS code shown for Protactinium-231 is indicative (it is known at chapter level only). Confirm the classification with your customs broker before shipping.

Frequently asked questions

Quick answers about Protactinium-231, based on the data on this page

What is Protactinium-231?

Protactinium-231 is a chemical substance with the molecular formula Pa and a molar mass of 231.04 g/mol. Its CAS registry number is 14331-85-2.

What is the CAS number of Protactinium-231?

The CAS registry number of Protactinium-231 is 14331-85-2.

What is the molecular formula and weight of Protactinium-231?

The molecular formula of Protactinium-231 is Pa and its molar mass is 231.04 g/mol.

What is Protactinium-231 used for?

Known uses and roles of Protactinium-231 include isotope-labelled compounds in research and laboratory.

Is Protactinium-231 hazardous?

No GHS hazard classification for Protactinium-231 is recorded on CompoundList yet. That does not prove it is safe. Always read the supplier safety data sheet.

What is the HS code of Protactinium-231?

Protactinium-231 is usually classified under HS code 284443 (Radioactive elements and isotopes and compounds other than those of subheading 284410…). This is indicative, confirm it with your customs broker before shipping.

Where can I buy Protactinium-231?

Post a free request on CompoundList and suppliers of Protactinium-231 will send you quotes. Your contact details stay private until you accept a quote.

What is the price of Protactinium-231?

Suppliers quote Protactinium-231 on request because prices depend on grade, purity, quantity and destination. A free request on CompoundList gets you several quotes to compare.

Guides for buyers

Practical guides that help when you source, ship or handle Protactinium-231

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Data last updated 7 Oct 2026. Details may have changed, please confirm them with the supplier. Report an error on this page
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