why do elements like copper iron show variable valency .plzzz explain.............

3 years ago

Share

Answers : (4)

                                        

Because copper and iron have same number of electrons in outermost orbit

3 years ago
                                        

The IUPAC definition limits valence to the maximum number of univalent atoms that may combine with the atom, that is the maximum number of valence bonds that is possible for the given element.
The oxidation state of an atom in a molecule gives the number of valence electrons it has gained or lost. In contrast to the valency number, the oxidation state can be positive (for an electropositive atom) or negative (for an electronegative atom). 
Not only d block elements have variable valency, Oxygen, Nitrogen, etc., some inert pair effected elements also having variable oxidation state

3 years ago
                                        

i think this is due to inert pair effect because when there is an increase in numbr of orbitals the electrons of outer most shell do held tightly and hence they do show variable oxidation states. infact not only copper, iron, nd d- blok elements but others do so for example thallium, lead, etc. summing up the d nd f orbitals show poor screening effect. hence the case so.

3 years ago
                                        

because they have variable electronic configuration

2 years ago

Post Your Answer

More Questions On Physical Chemistry

Ask Experts

Have any Question? Ask Experts
Post Question
 
Answer ‘n’ Earn
Attractive Gift
Vouchers
To Win!!!
Click Here for details
in physical chemistry my mole concept portion is weak... how to improve it for jee..
 
 
no need to worry always remember mole is only a quantity representing 6.023 *10^23 practise as many problrm as you can from good reference book like rc mukherjee or p bahadur it is also...
  img
Sunil Kumar FP one month ago
stucture of SO4 covant bond
 
 
I have attached the structure of SO4 covalent bond , SO4 has total 32 electrons, remember -2 charge counts as 2 valence electrons. It is a type of hypervalent molecule and their octet is...
  img
Ruchi Shaw 11 days ago
why characteristics of anode rays depend upon the nature of electrods and gases present in it
 
 
Anode rays are because of diff e/m ratio nucleus containing protons and neutrons and different atoms have different ratio of protons to neutrons so e/m ratio differs(since mass is also...
  img
Sunil Kumar FP one month ago
molten alluminum chloride is electrolysed using a current of 0.5A to produce 27g of alluminum calculate the number of faradays of electricity consumed
 
 
molten alluminum chloride is electrolysed using a current of 0.5A to produce 27g of alluminum therefore the number of faradays of electricity consumed AL^3+ 3e- ------Al 1 mole is deposited...
  img
Sunil Kumar FP one month ago
convert the following into basic unit; 28.7 pm 15.15 pm 25365
 
 
0.0000000000287 0.00000000001515 25365
 
akash 10 days ago
What is the hybridisation of Phosphorus in PH3?
 
 
for phospine it is sp3 because the hybrid was just resulted from sigma bond of the 3s orbital of the H and p orbital of the P,however, only 3 bonds will form because the remaining two...
  img
Sunil Kumar FP 19 days ago
 
sir,will the drago rule not be applied here?
 
vineet chatterjee 19 days ago
View all Questions »