Question

what is meant by valency and balance election explain by giving example of manegisum

Answer 1

Hi friends.....

Here is your answer...

Valency of an element refers to the combining capacity of it when measured with the number of hydrogen atoms it can displace.
The valency of an element is the number of atoms present in the outer most shell.
Valency of Magnesium is 2

Balance equation refers to the equation in which the number of atoms of an element in both the product side as well as in the reactants are equal.
This is done on the basis of law of conservation of mass.
Eg :2Mg +O™2 - - - - - - - >2MgO

Hope my answer will help you.....

Answer 2

Valency is basically the tendency of an atom to lose or gain a specific no. of atoms to attain stability . These can be defined as in the case of magnesium the atomic no. is 12 means inner most shell will have 2 electrons and then 8 and then 2 ... Here in this case magnesium needs to lose 2 electron to attain stability ... Hence the valency of magnesium is 2 .

And it is Valance electron not balance electron ..... In this case ... it is the no . of atoms in the valence shell that is the outer most cell . In the case of Magnesium as we have already discussed above ... magnesium needs to loose 2 electrons that means there are 2 electrons in the valence shell and hence the no. of valence electron = 2 ...

Note that valency of the element to lose or gain electrons so as to attain stability whereas valence electrons are the no. of electrons present in the valence shell or the outermoat shell ...

Hope it helps ....... :)