Question

how to calculate the valency of cobalt​

Answer 1

Answer:

✤The valency is the number of the electrons that an atom gains , loses or even shares during a chemical reaction , The valency is the number of electrons that an atom needs to gain or lose on order to achieve noble gas electronic configuration ,

✤The chemical reaction , the atoms try to reach the stable state by losing their outermost electrons ( as in case of the metals ) or by sharing a number of electrons with other atoms ( as in case of nonmetals ) .

✤You should know the valency of the elements or the ions to write the chemical formula of a compound , Chlorine has a valency of 1 as it needs to gain 1 electron to achieve noble gas electronic configuration .

✤The atoms try to reach the stable state by gaining a number of electrons to complete the outer shell by ( 8 ) electrons ( as in case of nonmetals ) .

✤The outermost electrons of an atom determine its valency , the valency of an element measures its ability to combine with the other elements , The valency is determined by the number of electrons in the outer shell of each atom of an element .

✤The electron configuration of Cobalt is 27Co [Ar] 4s2 3d7. The number of valenceelectrons are held in the outtermost energy level or shell which in this case is 4 ;

❀❀ so THE NUMBER OFVALENCE ELECTRONS of Cobalt is 2