Answer
Verified
396.6k+ views
Hint: (i) The transition metals are the members of d-block elements. They have partially filled d-subshell which can give rise to cationic species.
(ii) The magnetic properties of transition elements decrease with the decrease in the number of unpaired electrons.
Complete answer:
(i) -In the periodic table, the elements of groups 4 to 11 are recognized as transition metals.
-Transition metals either as an element or an ion show good catalytic properties.
-Transition metals form a large range of colored complexes because of the following reasons-
(a) They show variable oxidation states. The oxidation states of some common transition metals are given below-
(b) They have a small size and high ionic charge. In transition metals, the number of electrons is increasing as we move across a period, and thus, there is more pull of these electrons towards the nucleus. Transition metals have a charge equal to its oxidation state which can vary from +1 to +7.
(c)Transition metals have unstable electrons in their outer orbitals hence they can readily lose electrons than other elements to form complexes.
(d)Transition metals have partially filled d-orbitals for the bond formation. The d-orbital in total can accommodate 10 electrons which makes it possess a great tendency to form complexes.
(ii) -Based on the behavior of compounds in a magnetic field, substances are classified as paramagnetic, diamagnetic, and ferromagnetic.
-The substances which are strongly repelled by the applied magnetic field are called diamagnetic substances.
- The substances which are attracted by the applied magnetic field are called paramagnetic substances.
-The substances which are strongly attracted by the applied magnetic field are called ferromagnetic substances.
-Most of the transition elements exhibit paramagnetic behavior.
-Transition elements have unpaired electrons in (n-1)d orbitals which are responsible for the magnetic properties of transition elements. As we move from left to right along transition elements, the number of unpaired electrons increases from one to five, and hence there is an increase in paramagnetic behavior.
- In the 3d transition series from Sc to Mn, the number of unpaired electrons increases, and hence paramagnetic character increases. After Mn, the pairing of electrons starts and the number of electrons decreases, and hence a decrease in paramagnetic property is observed.
Note: Transition metals have an unparalleled tendency to form more coordination complexes as compared to s block elements and p block elements. There are many important catalysts formed by transition metals for various reactions like $TiC{{l}_{3}}$ (used as Ziegler – Natta catalyst), $FeS{{O}_{4}}$ and ${{H}_{2}}{{O}_{2}}$ (Fenton’s reagent) and many more.
(ii) The magnetic properties of transition elements decrease with the decrease in the number of unpaired electrons.
Complete answer:
(i) -In the periodic table, the elements of groups 4 to 11 are recognized as transition metals.
-Transition metals either as an element or an ion show good catalytic properties.
-Transition metals form a large range of colored complexes because of the following reasons-
(a) They show variable oxidation states. The oxidation states of some common transition metals are given below-
Sc | Ti | V | Cr | Mn | Fe | Co | Ni | Cu | Zn |
+2 | |||||||||
+2 | +2 | +2 | +2 | +2 | +2 | +2 | +1 | +2 | |
+3 | +3 | +3 | +3 | +3 | +3 | +3 | +3 | ||
+4 | +4 | +4 | |||||||
+5 | |||||||||
+6 | +6 | +6 | |||||||
+7 |
(b) They have a small size and high ionic charge. In transition metals, the number of electrons is increasing as we move across a period, and thus, there is more pull of these electrons towards the nucleus. Transition metals have a charge equal to its oxidation state which can vary from +1 to +7.
(c)Transition metals have unstable electrons in their outer orbitals hence they can readily lose electrons than other elements to form complexes.
(d)Transition metals have partially filled d-orbitals for the bond formation. The d-orbital in total can accommodate 10 electrons which makes it possess a great tendency to form complexes.
(ii) -Based on the behavior of compounds in a magnetic field, substances are classified as paramagnetic, diamagnetic, and ferromagnetic.
-The substances which are strongly repelled by the applied magnetic field are called diamagnetic substances.
- The substances which are attracted by the applied magnetic field are called paramagnetic substances.
-The substances which are strongly attracted by the applied magnetic field are called ferromagnetic substances.
-Most of the transition elements exhibit paramagnetic behavior.
-Transition elements have unpaired electrons in (n-1)d orbitals which are responsible for the magnetic properties of transition elements. As we move from left to right along transition elements, the number of unpaired electrons increases from one to five, and hence there is an increase in paramagnetic behavior.
- In the 3d transition series from Sc to Mn, the number of unpaired electrons increases, and hence paramagnetic character increases. After Mn, the pairing of electrons starts and the number of electrons decreases, and hence a decrease in paramagnetic property is observed.
Note: Transition metals have an unparalleled tendency to form more coordination complexes as compared to s block elements and p block elements. There are many important catalysts formed by transition metals for various reactions like $TiC{{l}_{3}}$ (used as Ziegler – Natta catalyst), $FeS{{O}_{4}}$ and ${{H}_{2}}{{O}_{2}}$ (Fenton’s reagent) and many more.
Recently Updated Pages
Basicity of sulphurous acid and sulphuric acid are
Three beakers labelled as A B and C each containing 25 mL of water were taken A small amount of NaOH anhydrous CuSO4 and NaCl were added to the beakers A B and C respectively It was observed that there was an increase in the temperature of the solutions contained in beakers A and B whereas in case of beaker C the temperature of the solution falls Which one of the following statements isarecorrect i In beakers A and B exothermic process has occurred ii In beakers A and B endothermic process has occurred iii In beaker C exothermic process has occurred iv In beaker C endothermic process has occurred
What is the stopping potential when the metal with class 12 physics JEE_Main
The momentum of a photon is 2 times 10 16gm cmsec Its class 12 physics JEE_Main
How do you arrange NH4 + BF3 H2O C2H2 in increasing class 11 chemistry CBSE
Is H mCT and q mCT the same thing If so which is more class 11 chemistry CBSE
Trending doubts
Difference between Prokaryotic cell and Eukaryotic class 11 biology CBSE
Difference Between Plant Cell and Animal Cell
Fill the blanks with the suitable prepositions 1 The class 9 english CBSE
Change the following sentences into negative and interrogative class 10 english CBSE
Give 10 examples for herbs , shrubs , climbers , creepers
What organs are located on the left side of your body class 11 biology CBSE
Write an application to the principal requesting five class 10 english CBSE
What is the type of food and mode of feeding of the class 11 biology CBSE
Name 10 Living and Non living things class 9 biology CBSE