Francium, a chemical element with a symbol Fr, is among the highlyreactive alkali steels of group 1 with an atomic number 87 in the routine table. Francium is not discovered in a complimentary state in nature together it is extremely radioactive i.e. It has a half-life of only 22 minutes. It is the 2nd most rarest normally occuring element after astatine

As we know how much francium is being supplied in the human being ofchemistry, so us must have very great proper information around its electronic properties to survive in the human being of chemistry and that’s why friend are right here toknow what valence electrons and also valency offranciumare, aren’t you? but for thisyou need to know what these two terms are, so there is no wasting your time let"s gofor it,

Difference in between valence electrons and valency

Valence electrons space the total variety of electrons presentin the outermost covering of one atom (i.e. In outermost orbital). The valenceelectrons because that a neutral atom is constantly definite, it cannot be varied (more orless) in any condition for a specific atom and also may or not be same to itsvalency.

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Valency is identified as the total number of electrons one atomcan lose, gain, or re-superstructure at the moment of bond development to gain astable electronic configuration i.e. To finish an octet. The valency of an atom canbe change in various compounds or in chemistry reactions early to different bondingmechanisms.

Francium (Fr) valence electrons

There are four an easy steps to find out the valence electron forfranciumatom which are:

Step 1: uncover the atomic Number


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To find out the atomic number of francium, we deserve to use the periodictable. V the aid of the periodic table, we can easily see that the atomic number of franciumis 87. As its atom number is 87, it has actually a total of 87 protons, and also forneutral francium, the number of protons is constantly equal come the number of electronsi.e. 87 electron in the nucleus.

Step 2: create Electron Configuration


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Electron construction is the plan of electrons on theorbitals. The franciumatom has actually a complete of 87 electrons, so we need to put 87 electron in orbitals. The an initial two electrons will certainly go in the 1s orbital as Sorbital deserve to hold a preferably of two electrons only. The next two will go in 2sorbital and also the following six electrons will go in 2p orbital together P orbital can onlyhold a maximum of 6 electrons and so on...
Now wehave,
Francium electron construction Fr (87) =1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p67s1(completeconfiguration) or7s1(condensed configuration).

Step 3: recognize Valence Shell

As we know, the valence covering of an atom have the right to be found from the highest variety of principle quantum numbers which is expressed in the term of n, and also in7s1, the highest possible value the n is 7 so the the valence shell of Fr is 7s1.

Step 4: find Valence Electrons

The total number of electrons current in the valence shellof an atom is referred to as valence electrons, and there is only one electron presentin the valence covering of francium(7s1). Thus, francium has actually only one valenceelectron.

Valency that Francium (Fr)

There are numerous different means to discover out the valency of atom which reflects the capacity of an atom come bond with various other atoms. Valence describeshow easily an atom or a free radical can integrate with other chemical species. Thevalency of an atom is determined based on the number of electrons lost, gained, or mutual with another atom.

An atom is claimed to be stable once its outermost shells haveeight electron (except H and He). If the total variety of electrons inoutermost shells is in between one come four, the atom has positive valency and ifelectrons are in between four come eight, the valency is calculate by subtractingfrom eight and valency is negative. Atom having four outermost electronspossess both confident and an adverse valency and also atoms having actually eight outermostelectrons have actually zero valencies (i.e. Noble gases).

Alkali metals like francium reached the steady (nearest inertgas configuration) by losing one outermost electron. So the the valency the francium (Fr) is 1.

We can additionally find the valency the francium through the assist of a periodic table. As francium is an element of team 1 which indicated alkalimetals group and also valency of alkali steels are always 1.

Valence electrons and valency the Fr+

Francium-ion Fr+ method it has actually lost one electron and has just 86 electrons in the orbitals. The electron construction of neutral Fr is7s1but in Fr+ it loser one electron, so it has actually a new electron construction of1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p6means Fr+ has actually (2+6=8) outermost electron which provides it stable. Thus, the francium ion (Fr+) has actually eight valence electrons.

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Fr+ valency is not zero choose noble gas together their outermostshell has actually eight electrons. When a francium atom loser one electron, an Fr+ ion is produced and also that’s what valency is. So the Fr+ valency is +1, no zero.

Chemical Properties

Francium (Fr) atom
Atomic number87
Number the protons87
Number that electrons87
Electron configuration7s1
Valence electrons1
Valence/Valency1

Francium-ion (Fr+)
Number the electrons86
Electronic configuration1s22s22p63s23p63d104s24p64d105s25p64f145d106s26p6
Valence electrons8
Valence/Valency+1