default_background
✕

Find the best tutors and institutes for Class 11 Tuition

Find Best Class 11 Tuition

Please select a Category.

Please select a Locality.

No matching category found.

No matching Locality found.

Q3.30(ii):
Assign the position of the element having outer electronic configuration (ii) $(n-1)d^{2}ns^{2}$ for $n=4$, and

Solution :

Step 1: Substitution of Principal Quantum Number

Given the general outer electronic configuration: $(n-1)d^{2}ns^{2}$. For the specific case where $n = 4$, we substitute the value of $n$ into the expression:

  • Orbital term $(n-1)d^{2} = (4-1)d^{2} = 3d^{2}$
  • Orbital term $ns^{2} = 4s^{2}$

The complete outer configuration for this element is $3d^{2} 4s^{2}$. [Per the Aufbau Principle, electrons are filled in order of increasing energy, with $4s$ filling before $3d$].

Step 2: Determining the Total Number of Electrons

To identify the element, we must determine the full electronic configuration by filling all preceding subshells (Argon core configuration is $[Ar] = 1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6}$):

Total Configuration: $1s^{2} 2s^{2} 2p^{6} 3s^{2} 3p^{6} 3d^{2} 4s^{2}$

Summing the electrons: $2 + 2 + 6 + 2 + 6 + 2 + 2 = 22$. The element with atomic number $Z = 22$ is Titanium (Ti).

Step 3: Assigning Period, Group, and Block

  • Block: Since the last electron enters the $d$-orbital, the element belongs to the $d$-block. [Per the definition of transition elements].
  • Period: The principal quantum number of the outermost shell ($ns$) is 4. Thus, the element is in Period 4.
  • Group: For $d$-block elements, the group number is calculated as:
    $\text{Group Number} = (\text{Number of } (n-1)d \text{ electrons}) + (\text{Number of } ns \text{ electrons})$
    $\text{Group Number} = 2 + 2 = 4$.
    Therefore, the element is in Group 4.

Visual Representation of Orbital Occupancy

3d² 4s² n-1 subshell ns subshell

Summary of Elemental Classification

Parameter Assignment
Atomic Number 22
Block d-block
Period 4
Group 4

Final Solution: The element with configuration $(4-1)d^{2}4s^{2}$ is Titanium (Ti), located in Group 4, Period 4, and belonging to the d-block.


More Questions from Class 11 Chemistry Classification of Elements and Periodicity in Properties EXERCISES


CBSE Solutions for Class 11 Chemistry Classification of Elements and Periodicity in Properties


Chapters in CBSE - Class 11 Chemistry


Top Tutors who teach Classification of Elements and Periodicity in Properties

Manjunath  Class 11 Tuition trainer in Bangalore
(101)
superTutorSuper Tutor
locationImg Jayanagar East, Bangalore
experience 4 yrs of Exp students 47 students
greenClock 5902 hrs of classes completed
rsIcon 250 per hour
PhD Organic Chemistry at IIT Madras - One to One Tuition and Group Tuition
Online Classes Online Classes
regularClasses Tutor's home

I take classes for grade 11 of Karnataka State PUC, CBSE, ISC, NIOS and Cambridge or IGCSE AS Levels. I have 4 years of teaching experience.

Reena Roy

Attending this introductory chemistry demonstration session offered an insightful look into the program's academic standard. The instructor demonstrated excellent command of the subject matter, skillfully translating intricate chemical principles into accessible intellectual concepts.

Skills: Chemistry
Also teaches: CET Coaching, Class 10 Tuition and more

(19)
Top Tutor
locationImg Jayanagar 4th block, Bangalore
experience 11 yrs of Exp students 1 student
greenClock 296 hrs of classes completed
rsIcon 400 per hour
Home Science and Psychology teacher with 11 years of total teaching experience.
Online Classes Online Classes

- Helping the student gain confidence in themselves and with respect to the subject. - Thorough preparation with the help of model and previous year question papers. - Understanding the student's learning style and adapting my teaching style accordingly. - Making lessons interesting by using different methods of teaching (Sharing relevant YouTube links and weblinks).

Divya

I like the faculty and I feel I had the best environment for my studies . I learned the new things from my teachers who were very helpful in every way they could. You have been a great lecturer to me, and I fully enjoyed your lectures, you explained everything in detail about the media and early childhood education and way of storytelling etc, referring the notes given to us , it made it easier for me to understand. I'm beyond thankful to have you as one of my lecturer in my Masters. Thank you

Skills: Psychology , Home Science

Deepak Joshi Class 11 Tuition trainer in Bangalore
(50)
Top Tutor
locationImg Ashok Nagar D' Souza Layout, Bangalore
experience 13 yrs of Exp students 4 students
greenClock 1062 hrs of classes completed
rsIcon 700 per hour
Ph.D. Candidate | M.Sc. (Mathematics) | Former Faculty at BYJU'S (7 Years) & DPS Gurgaon (6 Years)
Online Classes Online Classes

13+ years of experience teaching Mathematics for grades 10 to 12. • Consistent record of 100% academic results. • Very friendly and supportive learning environment. • Encourages students to ask questions freely and confidently. • Strong focus on conceptual clarity and problem-solving skills. • Helps students build confidence and excel in Mathematics. • Fee structure for one-to-one classes: ₹800 per hour.

Aryan

He is a very good and experienced teacher who helps he improve at maths significantly. I used to get really bad marks earlier and then I started doing classes with him and I saw a significant improvement in my marks. He is one of the best maths teachers I have ever had.

Skills: Mathematics
Also teaches: Class 9 Tuition, Class 10 Tuition and more

(3)
Top Tutor
locationImg Sector 38, Chandigarh
experience 8 yrs of Exp students 1 student
greenClock 10 hrs of classes completed
Online Classes Online Classes

i am a teacher....I am giving home/online tuition since last 8years..I have a degree in masters of biotechnology...My key skills are best in competition as well as theoratical classes...I worked as biology project head in various institute as well as in various schools for preparing kids for NEET and for other medical entrance exams.

Skills: Biology

(1)
Top Tutor
locationImg Suddagunte Palya Balaji Nagar, Bangalore
experience Less than a yr Exp students 2 students
greenClock 27 hrs of classes completed
rsIcon 1000 per hour
Ph.D. Scholar, Researching on AI (Computer Science) and Exoplanetary Science (Physics).
Online Classes Online Classes

I am a Ph.D. Scholar. I completed my BCA from Calicut University, finished my MCA from Kristu Jayanti College (Autonomous), and currently pursuing my Ph.D. in Christ (Deemed to be University). Now, I am doing my research in Artificial Intelligence (Computer Science) and Exoplanetary Science (Physics). Therefore, I have relevant knowledge and experience in Computer Science and Physics concepts, including advanced topics like AI, ML, DL, NLP, Quantum Mechanics, Astrophysics, etc...

Skills: Physics , Computer Science
Also teaches: Class 12 Tuition, Class 10 Tuition and more

Other Subjects in CBSE - Class 11

Worksheet Icon

Download free CBSE - Class 11 Chemistry Classification of Elements and Periodicity in Properties EXERCISES worksheets

Download Now

Find Best Class 11 Tuition ?

Find Now »