Francium, a chemical aspect with a symbol Fr, is just one of the highlyreactive alkali metals of team 1 with an atom number 87 in the regular table. Francium is not discovered in a complimentary state in nature together it is very radioactive i.e. It has actually a half-life of only 22 minutes. It is the 2nd most rarest naturally occuring element after astatine

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

Difference between valence electrons and also valency

Valence electrons space the total number of electrons presentin the outermost shell of an atom (i.e. In outermost orbital). The valenceelectrons for a neutral atom is always definite, it cannot be varied (more orless) in any condition because that a details atom and may or not be same to itsvalency.

You are watching: How many valence electrons does francium have


*

Valency is defined as the total variety of electrons one atomcan lose, gain, or re-superstructure at the time of bond formation to acquire astable digital configuration i.e. To complete an octet. The valency of an atom canbe variable in various compounds or in chemistry reactions due to various bondingmechanisms.

Francium (Fr) valence electrons

There are four straightforward steps to find out the valence electrons forfranciumatom i beg your pardon are:

Step 1: discover the atomic Number


*

To find out the atomic variety of francium, we have the right to use the periodictable. Through the assist of the periodic table, us can easily see that the atomic variety of franciumis 87. As its atom number is 87, it has a total of 87 protons, and also forneutral francium, the variety of protons is always equal come the number of electronsi.e. 87 electrons in the nucleus.

Step 2: create Electron Configuration


*

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

Step 3: identify Valence Shell

As we know, the valence shell of one atom have the right to be uncovered from the highest variety of principle quantum numbers which is express in the term of n, and in7s1, the highest value of n is 7 so the the valence shell of Fr is 7s1.

Step 4: uncover Valence Electrons

The total variety of electrons existing in the valence shellof an atom is called valence electrons, and also there is only one electron presentin the valence shell of francium(7s1). Thus, francium has only one valenceelectron.

Valency of Francium (Fr)

There are many different methods to discover out the valency of atom which mirrors the capacity of an atom come bond with various other atoms. Valence describeshow conveniently an atom or a cost-free radical can incorporate with various other chemical species. Thevalency of one atom is determined based on the number of electrons lost, gained, or mutual with another atom.

An atom is claimed to be stable as soon as its outermost shells haveeight electrons (except H and He). If the total variety of electrons inoutermost shells is in between one come four, the atom has actually positive valency and ifelectrons are between four to eight, the valency is calculation by subtractingfrom eight and also valency is negative. Atoms having 4 outermost electronspossess both confident and an adverse valency and also atoms having eight outermostelectrons have actually zero valencies (i.e. Noble gases).

Alkali metals like francium got to the secure (nearest inertgas configuration) by shedding one outermost electron. So that the valency of francium (Fr) is 1.

We can additionally find the valency the francium through the aid of a routine table. As francium is an element of group 1 which suggested alkalimetals group and valency the alkali steels are constantly 1.

Valence electrons and valency that Fr+

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

See more: What Are Three Types Of Motives ? What Are The 3 Types Of Motives

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

Chemical Properties

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

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