LIVE Course for free

Rated by 1 million+ students
Get app now
JEE MAIN 2023
JEE MAIN 2023 TEST SERIES
NEET 2023 TEST SERIES
NEET 2023
CLASS 12 FOUNDATION COURSE
CLASS 10 FOUNDATION COURSE
CLASS 9 FOUNDATION COURSE
CLASS 8 FOUNDATION COURSE
0 votes
1.5k views
in Chemistry by (30.0k points)
closed by
Calculate the effective nuclear charge felt by a 3d electron of chromium atom (z = 24).
1. 3.90
2. 4.60
3. 3.55
4. 4.20

1 Answer

0 votes
by (54.0k points)
selected by
 
Best answer
Correct Answer - Option 2 : 4.60

The correct answer is 4.60.

  • The formula for calculating the effective nuclear charge for a single electron is:
    • Zeff= Z − S
  • Zeff is the effective nuclear charge.
  • Z is the atomic number.
  • S is the average amount of electron density between the nucleus and the electron.
  • The atomic number of chromium is 24.
  • S requires the use of Slater’s Rules to determine the value.
    • For chromium, the electron configuration is (1s2) (2s2, 2p6) (3s2 3p6) (3d5) (4s1).
    • Any electrons to the right of the electron of interest contain no shielding value.
    • Therefore (4s)1do not contribute since we are focusing on the 3d orbital.
    • Electrons in the same group as the electron of interest shields 0.35 nuclear charge units.
    • For d or f electrons: all electrons shield 1.00 unit.
  • Zeff =24−(4×0.35)−(18×1).
  • Zeff = 24 - 19.4 = 4.6

Welcome to Sarthaks eConnect: A unique platform where students can interact with teachers/experts/students to get solutions to their queries. Students (upto class 10+2) preparing for All Government Exams, CBSE Board Exam, ICSE Board Exam, State Board Exam, JEE (Mains+Advance) and NEET can ask questions from any subject and get quick answers by subject teachers/ experts/mentors/students.

Categories

...