1800-150-456-789
FlagBACK
Flag Modern Physics> -ground-state-of-cr-atom...
question mark

Consider the ground state of Cr atom (Z = 24). The numbers of electrons with the azimuthal quantum numbers, = 1 and 2 are, respectively:

(A) 16 and 5

(B) 12 and 5

(C) 16 and 4

(D) 12 and 4

Amit Saxena , 11 Years ago
Grade upto college level
anser 3 Answers
Aditi Chauhan

Last Activity: 11 Years ago

(B)

 

Sol.    = 1 p and  = 2 for d.

 

        Now Cr has configuration

 

        1s2 2s2 2p6 3s2 3p6 3d5 4s1

 

        Hence there are 12, p-electrons and 5, d-electrons

 

Aviral singh

Last Activity: 6 Years ago

Answer is 2(second option)because the correct electronic configuration  of Cr is:1s2 1s2, 2s2, 2 2p6 p6, 3s2, 3p6, 4s1, 3d5.
Usually we consider the electronic configuration  as: 1s2, 2s2, 2p6, 3s2, 3p6, 4s2, 3d4.
But this is wrong because 3d4 wats to achieve half stability.So it takes 1 electron from 4s2.Now 4s2 becomes 4s1 and 3d4 becomes 3d5 and attains half stability.
Now, for l=1(azimuthal quantum number)subshell is p....
And here for subshell p, number of electrons(I.e.2p6 and 3p6)total no. Of electrons=12.
For l=2(azimuthal quantum number),subshell is d....and total number of electrons for subshell d(I.e.4d5)total no. Of electrons=5....
So the combination(12,5)....i.e.option(b) is correct.
 
 
 
Thank you🙏
 

Kushagra Madhukar

Last Activity: 4 Years ago

Dear student,
Please find the solution to your problem.
 
Cr has electronic configuration
1s2 2s2 2p6 3s2 3p6 3d5 4s1
Hence there are 12, p-electrons and 5, d-electrons
 
Thanks and regards,
Kushagra

Provide a better Answer & Earn Cool Goodies

star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments


Ask a Doubt

Get your questions answered by the expert for free

Other Related Questions on modern physics

question mark
A particle is projected in vertical plane such that after 5 seconds its velocity becomes horizontal. The maximum height attained by the projectile from point of projection is n3 m. The value of n is _______. (g = 10 m/s2)
modern physics
1 Answer Available

Last Activity: 2 Years ago

question mark
Two particles approach each other from very large distance as shown, . if the least separation between the particles is b, what is the speed of M in center of mass frame when particles are closest? (gravity negligible)
modern physics
0 Answer Available

Last Activity: 2 Years ago

question mark
Can the sum of two equal vectors be equal to either vector
 
modern physics
0 Answer Available

Last Activity: 2 Years ago

question mark
A nucleus X184 at rest emitt alpha particle With kinetic energy 9.0MeV. The product Nucleus is Y. The values of Binding energy per nucleon of alpha particle & Y differ by 1.5MeV. The values of Binding energy per nucleon of X & Y differ by (nĂ·230) MeV, then n is
modern physics
0 Answer Available

Last Activity: 2 Years ago

question mark
SUBJECT: PROBLEM BASED ON LINE DETECTION.
Query: How to apply all the filters for line detection on the following piece of image (provided below)? Explain its Observations to comment on its results.
modern physics
0 Answer Available

Last Activity: 3 Years ago