Single Choice

Which of the following statements is/are incorrect?

AExtra stability of half filled and completely filled orbitals among s and p block elements is reflected in trends of IE across a period
BExtra stability of half filled and completely filled orbitals among s and p block elements is reflected in E.A. trends across a period
CAufbau principle is incorrect for cases where energy difference between ns and (n-1) d subshell is larger
Correct Answer
DExtra stability to half filled subshell is due to higher exchange energies

Solution

The stability of half-filled and fully filled configurations is reflected both in the IE as well as EA trends in s and p block elements. For example, the ionisation energy of Be is greater than that of B. The electron affinity of N is negative. Note: Electron affinity is negative of electron gain enthalpy. Similarly, exceptional configurations are seen in d block elements due to high exchange energy. However, Aufbau's principle is never violated ( exceptional cases may be there).

SIMILAR QUESTIONS

Atomic Structure

If Hunds rule is applicable, $$p^3$$ configuration is $$\upharpoonleft$$ $$\upharpoonleft$$ $$\upharpoonleft$$ because in this arrangement:

Atomic Structure

The first ionisation potential in electron volts of nitrogen and oxygen atoms are, respectively, given by :

Atomic Structure

Identify the least reactive element from the following.

Atomic Structure

According to Bohr - Bury scheme, the maximum number of electrons which can be accomodated in a given shell is given by the formula:

Atomic Structure

The stability of ferric ion is due to:

Atomic Structure

Which of the following ions contains minimum number of unpaired electrons?

Atomic Structure

Answer the following: The $$+3$$ oxidation state of lanthanum $$(Z=57)$$, gadolinium $$(Z=64)$$ and lutetium $$(Z=71)$$ are especially stable.

Atomic Structure

Compare : Chlorine atom and chloride ion, with respect to (i) atomic structure, (ii)electrical state

Atomic Structure

Compare : Chlorine atom and chloride ion, with respect to chemical action

Atomic Structure

Compare : Chlorine atom and chloride ion, with respect to toxicity.

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