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Lesson Posted on 23 Feb CBSE/Class 12/Science/Chemistry/Unit VII: p - Block Elements Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching Exam Coaching/NEET-UG Coaching +3 CBSE CBSE/Class 12 CBSE/Class 11/Science/Chemistry less

Inert Pair Effect in Group 13

Dr.Nazma Shaik

Doctorate in chemistry. I have 7 years of mentoring to JEE/NEET students across INDIA through online...

Inert Pair Effect in Group 13In the modern periodic table, the elements of the boron family present in group 13 are:Boron (B), Aluminium (Al), Gallium (Ga), Indium (In) and Thallium (Tl)Their general electronic configuration of the valence shell is ns 2 np 1. They have a total of 3 electrons in their... read more

Inert Pair Effect in Group 13

In the modern periodic table, the elements of the boron family present in group 13 are:
Boron (B), Aluminium (Al), Gallium (Ga), Indium (In) and Thallium (Tl)
Their general electronic configuration of the valence shell is ns 2 np 1. They have a total of 3 electrons in their valence shell. Thus, the elements of the boron
family adopt the oxidation states of +3 (group oxidation state) and +1. The +3 oxidations state is favourable for the lighter elements of the group,
whereas, +1 oxidation state is preferable for the heavier elements of the group; for example, Tl has the stable oxidation state of +1.
The stability of the oxidation state two units less than the group oxidation state of the heavier members can be explained by the concept called the inert pair effect. To explain this let’s look into the electronic configuration of each member of the boron family:
B Al Ga In Tl

 

B
    

Al
    

Ga
    

In
    

Tl

[He]2s22p1
    

[Ne]3s23p1
    

[Ar]3d104s24p1
    

[Kr]4d105s25p1
    

[Xe]4f145d106s26p1

 

The elements present in periods 4, 5 and 6 have d-orbital (f- orbital for 6 th period) electrons along with s- and p-orbitals with electrons. The
shielding effect of different orbitals follows the order:
s > p > d > f
Due to the poor shielding effect of the intervening d and f-orbitals, the effective nuclear charge increases which tightly holds the ns electrons. As
a result, the inert pair of ns electrons are more tightly held by the nucleus, and hence, they can not participate in bonding. The remaining np
electron (only 1) involves in bonding. Thus, +1 oxidation state predominates in Tl. The reluctance of ns- electrons to take part in bonding due to
the poor shielding effect of d and f- orbitals on moving down a group is called inert pair effect.

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Answered on 18 Feb Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching

Vijendra Singh

Tutor

Dont take any extra load but surely it will create solid foundation in science subjects which help you for competition exams like NDA JEE and BITsats
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Lesson Posted on 12/11/2018 Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching Exam Coaching/NEET-UG Coaching

Amazing Ways to Solve ANY Chemical Bonding Problem-BOND ORDER

Dr.Nazma Shaik

Doctorate in chemistry. I have 7 years of mentoring to JEE/NEET students across INDIA through online...

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Answered on 29/11/2018 Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching

A small body slides along equally rough circular surfaces from A to B via route 1 and 2 of equal radius.... read more

A small body slides along equally rough circular surfaces from A to B via route 1 and 2 of equal radius. In which case will the body's velocity be greater?

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Devanand Kumar

In this case Velocity of the body depends on coefficient of friction, if trace 1 and 2 have same value coefficient of friction then A and B have same velocity but more value coefficient of friction have more value
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Answered on 18/09/2018 CBSE/Class 11/Science Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching

Anil Kumar Nanduri

Senior Lecturer Chemistry at Narayana

U want on line or off line
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Answered on 23/08/2018 Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/IIT JEE Advanced Coaching Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/IIT JEE Crash Course +5 Tuition/BSc Tuition Tuition/BTech Tuition CBSE/Class 11/Commerce/Economics CBSE/Class 11/Science/Chemistry CBSE/Class 11/Commerce less

Aishee Sikder

Tutor

Give Yourself some times to study atleast 1hr-1.5hrs late at night!At night,u first complete all your studies and home work for very next day.If u cant complete withing these hours left it behind and try to compete it after the school hours before going coaching classes.Make a routine for your tuition... read more

Give Yourself some times to study atleast 1hr-1.5hrs late at night!At night,u first complete all your studies and home work for very next day.If u cant complete withing these hours left it behind and try to compete it after the school hours before going coaching classes.Make a routine for your tuition classes and accordingly u give time for each and every subject.Comparatively u wake up early in the morning.If u study late nights.Then Try to get up in the morning and take your time to revise all your homeworks.So that u r able to answer all your coaching and school teachers question.Equally u need Rest too!!24hours r there..combine all your time and have a good sleep!!

That's it!! THANK YOU.

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Answered on 07/12/2018 Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/IIT JEE Advanced Coaching Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/IIT JEE Crash Course +5 Tuition/BSc Tuition Tuition/BTech Tuition CBSE/Class 11/Commerce/Economics CBSE/Class 11/Science/Chemistry CBSE/Class 11/Commerce less

Neha Sharma

Commerce and law Tutor

It depends on students level of basic knowledge . If basics of any subject is not clear than it is shear wastage of time sitting in coaching classes and student should join individual Tution with best tutor and first should clear the basics of his/her subject. If student is well versed with basics... read more

It depends on students level of basic knowledge . If basics of any subject is not clear than it is shear wastage of time sitting in coaching classes and student should join individual Tution with best tutor  and first should clear the basics of his/her subject. 

If student is well versed with basics of subject than may join coaching . 

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Answered on 04/07/2018 Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/IIT JEE Advanced Coaching Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching/IIT JEE Crash Course +5 Tuition/BSc Tuition Tuition/BTech Tuition CBSE/Class 11/Commerce/Economics CBSE/Class 11/Science/Chemistry CBSE/Class 11/Commerce less

Abhishek Srivastava

Tutor

You have to plan your study and manage time by yourself for this you should understand and analyse what is important and what is not to achieve your goal. Make schedule or time table for utilizing your time in best manner.
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Answered on 11/05/2016 Exam Coaching/Engineering Entrance Coaching/IIT JEE Coaching

Smita Brahmachari

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Since refractive index of lens is less than refractive index of surroundings, it will behave as a convex lens.
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