Protactinium Properties (25 Facts You Should Know)


Pa or protactinium is the second member of the actinide series. Let us discuss protactinium in this article.

Protactinium is a dense, silvery grey metal that can readily react with oxygen, inorganic acids, and water vapor. The natural abundance of protactinium is very traced in the Earth’s crust at uraninite ore. It is also a radioactive actinide metal element.

In this article, we will discuss the position of protactinium in the periodic table, its melting as well as boiling point, oxidation state, ionization energy, allotrope, and isotopes.

1. Protactinium symbol

“Pa” is the chemical symbol for protactinium.

Protactinium Atomic Symbol

2. Protactinium group in the periodic table

Being an actinide, Pa does not have a proper group in the periodieke tabel.

3. Protactinium period in the periodic table

As per electron number, Pa is placed in the 7th period of the periodic table along with other actinides.

4. Protactinium block in the periodic table

The valence orbital of Pa is 5f so it belongs to f-blok elements like other actinides.

5. Protactinium atomic number

The Z value of Pa is equal to 91, which means its atomic number is also 91 (91 electrons and 91 protons).

6. Protactinium atomic Weight

Due to higher-order elements, the atomic weight of Pa is 237 on the 12C scale which means it is 237/12 times heavier than carbon.

7. Protactinium Electronegativity according to Pauling

The electronegativity value for pa is very low, 1.5 which indicates that it forms electropositive ions only.

8. Protactinium atomic Density

The weight of one atom of Pa is 15.2 g/cm3 (heavy element) which is its atomic density and it is calculated by, atomic density = atomic mass / atomic volume.

9. Protactinium melting point

Protactinium has a melting point of 15680 C or 917K because it has a body-centered tetragonal crystal in the solid lattice form and needs more energy to break this type of crystal.

10. Protactinium boiling point

Pa has a higher boiling point of 40000C or 4273K among other actinides because it has a higher force of attraction present in the liquid state.

11. Protactinium Van der Waals radius

Like other actinides, protactinium has 200 pm van der Waal’s radius because it has a 7s orbital of greater spatial distribution along with 5f and 6d orbital which has a poor shielding effect so the value is lower than expected.

12. Protactinium ionic radius

The ionic radius of Protactinium is 200 pm due to the formation of the mono cation.

13. Protactinium isotopes

Elemente met dieselfde aantal elektrone maar verskillende massagetalle word genoem isotope of the original element. Let us discuss the isotopes of Protactinium.

Protactinium has 34 isotopes depending on the neutral numbers which are –

  • 211Pa
  • 212Pa
  • 213Pa
  • 214Pa
  • 215Pa
  • 216Pa
  • 217Pa
  • 218Pa
  • 219Pa
  • 220Pa
  • 220m1Pa
  • 220m2Pa
  • 221Pa
  • 211Pa
  • 222Pa
  • 223Pa
  • 224Pa
  • 225Pa
  • 226Pa
  • 227Pa
  • 228Pa
  • 229Pa
  • 229mPa
  • 230Pa
  • 231Pa
  • 232Pa
  • 233Pa
  • 234Pa
  • 234mPa
  • 235Pa
  • 236Pa
  • 237Pa
  • 238Pa
  • 239Pa
  • 240Pa

Only 7 isotopes of Protactinium are stable which are discussed below

isotoopNatuurlike
Oorvloed
Halfleeftydafgee
deeltjies
Aantal van
neutron
229PaSintetiese1.5 d138
230PaSintetiese17.4 d139
231Pa100%3.7 * 104 yα140
232PaSintetiese1.31 dβ141
233Paspoor26.94 dβ142
234Paspoor6.75 pmβ143
234mPaspoor1.17 mβ143
Isotopes of Protactinium

 

14. Protactinium electronic shell

The shell surrounding the nucleus as per principal quantum number and holding the electrons is called an electronic shell. Let us discuss the electronic shell of Protactinium.

The electronic shell for Pa is 2 8 18 32 20 9 2 which is distributed among the nearest orbitals around the nucleus having 1 to 7 principle quantum number because it has 91 electrons.

15. Protactinium electron configurations

The electronic configuration of Protactinium is 1s2 2s2 2p6 3s2 3p3d10 4s2 4p6 4d10 4f14 5s2 5p6 5d10 5f2 6s2 6p6 6d3 7s2 of [Rn]5f26d17s2 because it has 93 electrons and those are distributed by the Hund and Aufbau principle in the s, p, d, and f orbitals of respective principle quantum number around the nucleus.

16. Protactinium energy of first ionization

The first I.E. of Pa is 568 KJ/mol as the first electron removed from the 7s orbital is subject to relativistic contraction.

17. Protactinium energy of second ionization

The second I.E. for Pa is 1128 KJ/mol because the 2nd electron is removed from the excited state of the element and also from 7s orbital.

18. Protactinium energy of third ionization

The third I.E. is 1814 KJ/mol for Pa because the third electron is removed from the 6d orbital which has a poor shielding effect along with the 5f orbital so the energy required is very high.

19. Protactinium oxidation states

Although Protactinium is actinide, it can show a +2 to +5 oxidation state and among these +5 is the most stable oxidation state of this element due to the availability of the outer orbital.

20. Protactinium CAS number

The CAS number of the Protactinium molecule is 7440-13-3, wat deur die chemiese abstrakte diens gegee word.

21. Protactinium Chem Spider ID

The Chem Spider ID for Protactinium is 22387. By using this number, we can evaluate all the chemical data related to the Protactinium atom.

22. Protactinium allotropic forms

allotrope are elements or molecules with similar chemical properties but different physical properties. Let us discuss the allotropic form of Protactinium.

Protactinium has zero allotropic form due to its extensive radioactive nature.

23. Protactinium chemical classification

Protactinium is classified into the following categories:

  • Pa is the rare earth element
  • Pa is actinide heavy metal
  • Pa is a weakly radioactive element
  • Pa is an expensive metal

24. Protactinium state at room temperature

Protactinium exists in a solid at room temperature and this can be confirmed from its crystal structure in the lattice form which is body-centered tetragonal.

25. Is Protactinium paramagnetic?

Paramagnetisme is the tendency of magnetization in the direction of the magnetic field. Let us see whether Protactinium is paramagnetic or not.

Pa is paramagnetic in nature because there are two unpaired electrons in the 5f orbital and it is the spin-only value, but due to heavier elements, there is some orbital contribution also present in the value of the magnetism.

Gevolgtrekking

Protactinium is quite similar properties to neptunium which presents one element after the former because one is a pre-uranium element and the other is post-uranium. Pa is used for radioactive dating for sediments of thorium and uranium. Pa can form various organometallic compounds at a +5 oxidation state.

Biswarup Chandra Dey

Hi......ek is Biswarup Chandra Dey, ek het my Meestersgraad in Chemie voltooi. My spesialiseringsgebied is Anorganiese Chemie. Chemie gaan nie net oor lees reël vir reël en memorisering nie, dit is 'n konsep om op 'n maklike manier te verstaan ​​en hier deel ek met jou die konsep oor chemie wat ek leer omdat kennis die moeite werd is om dit te deel.

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