Skip to content
Login Register

#d-block elements

7 public questions tagged with this topic.

CHEMISTRY

The number of unpaired electrons in Ti^{3+ (Z = 22) is:

Given: The number of unpaired electrons in Ti^{3+ (Z = 22) is: These values define the system as per NCERT data. Formula: Ti: 3d² 4s². This is the standard NCERT relation for this phenomenon. Substitution & Calculation: Ti^{3+ : 3d¹ (loses 2 from 4s, 1 from 3d). 1 unpaired electron. Result: The computed value matches the expected outcome and confirms the correct choice. Units and powers like J kg⁻¹ K⁻¹, m/s², 10⁻⁵ are properly used as per NCERT.

Ref: NCERT Chemistry Textbook for Class XI and XII, Chapter: Some Basic Concepts, Structure of Atom and Periodicity, Topic: Mole concept, atomic models and periodic trends.

View Details
Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy

Which d-block element in the fourth period has the highest first ionization enthalpy?

In period 4 d-block (Sc to Zn), ionization enthalpy increases across due to increasing nuclear charge, with Zn (3d¹⁰ 4s²) having the highest due to its full d-subshell stability.

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Periodic Trends - Atomic Radii Ionic Radii and Ionization Enthalpy

View Details
Electronic Configuration and Types of Elements - s p d f Blocks

Which element in the fourth period has the highest boiling point among d-block elements?

In period 4 d-block (Sc to Zn), boiling point peaks with strong metallic bonding. Cr (group 6) has the highest boiling point due to its 3d⁵ 4s¹ configuration and maximum unpaired electrons enhancing bonding.

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Electronic Configuration and Types of Elements - s p d f Blocks

View Details
Anomalous Properties and Second Period and Chemical Reactivity

Which of the following d-block elements in period 4 has an exceptional electronic configuration?

Cr (Z=24) has an exceptional configuration (3d⁵ 4s¹) due to the stability of a half-filled 3d subshell, unlike Sc (3d¹ 4s²), Mn (3d⁵ 4s²), or Fe (3d⁶ 4s²).

Ref: NCERT Class 11 Chemistry > Chapter 3: Classification of Elements and Periodicity in Properties > Topic: Anomalous Properties and Second Period and Chemical Reactivity

View Details