The extra stability of a half-filled subshell comes partly from exchange energy. Count one exchange for every pair of electrons that are in the same subshell and have parallel spins. Compare the outer electrons of chromium in its true ground state, 3d⁵ 4s¹, with the configuration 3d⁴ 4s² that the simple filling order predicts. How many more exchanges does 3d⁵ 4s¹ have than 3d⁴ 4s²?

ChemistryHardHigh School (11–12)Structure of the Atom › Electronic Configuration and Valency JEE Main JEE Advanced

The extra stability of a half-filled subshell comes partly from exchange energy. Count one exchange for every pair of electrons that are in the same subshell and have parallel spins. Compare the outer electrons of chromium in its true ground state, $3d^5\,4s^1$ , with the configuration $3d^4\,4s^2$ that the simple filling order predicts. How many more exchanges does $3d^5\,4s^1$ have than $3d^4\,4s^2$ ?

Type your answer as a number (a decimal point is allowed). A wrong answer may cost marks.

← All Quizzes

← A hydrogen-like ion has one electron. The energy needed to remove that electron when it is in the first excited state (n = 2) is 30.6 eV. How much energy, in eV, is needed to lift the electron of this ion from its ground state to the orbit n = 3? Use En = -13.6 Z²/n² eV and give the answer to the nearest integer.The figure shows how the largest kinetic energy of the photoelectrons depends on the frequency of the light for two metals, P and Q. The two straight lines are parallel; they meet the frequency axis at 5.0 × 10¹⁴ Hz for P and 7.5 × 10¹⁴ Hz for Q. Light of frequency 12.5 × 10¹⁴ Hz falls on both metals. What is the ratio of the largest speed of the electrons from P to that of the electrons from Q? →

More onStructure of the Atom › Electronic Configuration and Valency

Discussion (0)

Loading…

Discussion (0)

Problems on this topic