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
how to represent electrochemical cell ,constructed by iron and iodine electrode, where iodine electrode works as anode?
 
 
Fe3+ +e- -------Fe2+ (cathode) 2I- --------I2 +2e-(anode) thanks and regards sunil kr askIITian faculty
  img
Sunil Kumar FP one month ago
Question in image.
 
 
it represents instantaneous rate of reaction ans(c) The termrateis often used to describe the change in a quantity that occurs per unit of time. The rate of inflation, for example, is the...
  img
Sunil Kumar FP one month ago
RATE OF FORMATION OF SO(3) IN THE FOLLOWING REACTION 2SO 2 + O 2 ---- 2SO 3 IS 100g/min.HENCE RATE OF DISSAPEARANCE OF O 2 IS ?
 
 
ANSWER: 50g/min SOLUTION: 2SO 2 + O 2 --------- 2SO 3 In the above reaction , using rate law we get, -1/2*rate of apearance of SO 2 = -1* rate of apearance of O 2 = 1/2*rate of appearance of...
 
Anirudh 2 days ago
Cr(NH 3 )(CO 3 ) what is the oxidation no. of Cr?
 
 
the oxidation state of the metal atom is the charge that would exist on the atom if the bonding were completly ionic oxidation no. of Cr:- i think you are missing its a carbonate ligand and...
  img
Sunil Kumar FP 7 days ago
The homolytic fission of a hydrocarbon results in the formation of:- (a) carbonium ion (b) free radicals (c) carbanions (d) carbenes
 
 
It results in the formation of free radicals . Thanks & Regards Ruchi Shaw askIITians faculty
  img
Ruchi Shaw 4 months ago
 
It results in the formation of free radicals
 
sivakrishna 4 months ago
 
free radicals
 
raj kumar 4 months ago
if there is hydrogen bonding between nitro and oh then meta nitrophenol must b stronger acid than p ????????????? plz ans y meta is weaker
 
 
Nitro group is an electron withdrawing group and thus it attracts the electron density of the ring and also affects the O-H bond of the alcohol group due to the resonance so that the Oxygen...
  img
sumit kumar one month ago
View all Questions »