This category covers the general properties of d-block elements, focusing on their electronic configurations and trends. It provides foundational knowledge for students preparing for chemistry exams.
Tungsten (W) has the highest melting point (~3422°C) among all transition metals.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: General Properties of d-Block - Electronic Configuration and Trends
Mn shows up to +7 oxidation state (e.g., KMnO 4 ), the highest in the 3d series.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: General Properties of d-Block - Electronic Configuration and Trends
Co 2+ (Z=27) loses two 4s electrons, resulting in [Ar] 3d 7 configuration.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: General Properties of d-Block - Electronic Configuration and Trends
Cr 2+ (Z=24) loses two 4s electrons, resulting in [Ar] 3d 4 configuration.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: General Properties of d-Block - Electronic Configuration and Trends
Ni 2+ (Z=28) loses two 4s electrons, resulting in [Ar] 3d 8 configuration.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: General Properties of d-Block - Electronic Configuration and Trends
Comparable energies of (n-1)d and ns orbitals allow for variable electron loss.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: General Properties of d-Block - Electronic Configuration and Trends
Transition metal complexes are typically colored due to d-d transitions.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: General Properties of d-Block - Electronic Configuration and Trends
ZnSO 4 contains Zn 2+ with 3d 10 configuration (all electrons paired).
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: General Properties of d-Block - Electronic Configuration and Trends
Cr has an anomalous configuration due to the stability of half-filled d orbitals: [Ar] 3d 5 4s 1 .
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: General Properties of d-Block - Electronic Configuration and Trends
2MnO 4 - + 5C 2 O 4 2- + 16H + → 2Mn 2+ + 10CO 2 + 8H 2 O
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: General Properties of d-Block - Electronic Configuration and Trends
Lanthanoid contraction compensates for the expected increase in size from Zr to Hf.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: General Properties of d-Block - Electronic Configuration and Trends
Zn 2+ has all paired electrons (3d 10 ), making it diamagnetic.
Ref: NCERT Class 12 Chemistry > Chapter 4: d and f Block Elements > Topic: General Properties of d-Block - Electronic Configuration and Trends
