List of top Chemistry Questions on Electronic Configurations Of Elements And The Periodic Table

Which of the following has the least atomic radius?
Uncertainty principle is valid for:
What is the outer electronic configuration of Gd (Gadolinium, atomic number 64)?
Which of the following elements does not have a completely filled outermost shell in its ground state?
Match List-I with the List-II
List-I
Tetrahedral Complex		List-II
Electronic configuration
(A) TiCl4(I) e2, t20
(B) [FeO4]2-(II) e4, t23
(C) [FeCl4]-(III) e0, t22
(D) [CoCl4]2-(IV) e2, t23
Choose the correct answer from the options given below:
Which of the following ion/ions is/are diamagnetic?
How many electrons an atom have in M shell whose atomic number is 19?
Which of the following atoms would be paramagnetic?
Number of molecules/species from the following having one unpaired electron is ________.
\( \text{O}_2, \, \text{O}_2^{1-}, \, \text{NO}, \, \text{CN}^{1-}, \, \text{O}_2^{2-} \)
Match List I with List II
match
Choose the correct answer from the options given below :
The d-electronic configuration of $\left[ CoCl _4\right]^{2-}$ in tetrahedral crystal field is $e ^{ m } t _2 ^n$ Sum of "$m$" and "number of unpaired electrons" is
The IUPAC nomenclature of an element with electronic configuration $[ Rn ] 5 f ^{14} 6 d ^1 7 s ^2$ is :

When the excited electron of a H atom from n = 5 drops to the ground state, the maximum number of emission lines observed are ____.

Outermost electronic configurations of four elements A,B,C,D are given below:
(A) 3s2 (B) s23p1 (C) 3s23p3 (D) 3s23p4
The correct order of fist ionization enthalpy for them is:

The number of bridged oxygen atoms present in compound B formed from the following reactions is 

\(PB(NO_3)^2→(673 K)→A+PBO+O_2A→(Dimerise)B.\)

The IUPAC nomenclature of an element with electronic configuration [Rn] 5f146d17s2 is

The electronic configuration of Pt(atomic number 78) is:
In \(3d\) series, the metal having the highest \(M^{2+}/M\) standard electrode potential is
The number of terminal oxygen atoms present in the product B obtained from the following reaction is ______.
FeCr2O4 + Na2CO3 + O2 → A + Fe2O3 + CO2
A + H+ → B + H2O + Na+
Observe structures of the following compounds

The total number of structures/compounds which possess asymmetric carbon atoms is _____.
Consider the following electronic configuration:
Cu2+ = [Ar] 3d44s0
Cu+ = [Ar] 3d104s0
Which option is correct?
Write the general outer electronic configuration of \(s-, p-, d-\) and \(f-\) block elements.
The first\((\triangle_ iH_1)\) and the second \((\triangle_iH)\) ionization enthalpies (in \(kJ\; mol ^{-1}\) ) and the \((\triangle_{eg}H)\) electron gain enthalpy (in \(kJ \;mol^{ -1}\) ) of a few elements are given below: 
Elements                       \(\triangle_iH\)                \(\triangle_iH\)                \(\triangle_{eg}H\) 
   I                                    520                   7300                    -60 
  II                                    419                   3051                    -48 
  III                                  1681                  3374                    -328  
  IV                                  1008                 1846                    -295 
  V                                   2372                  5251                   +48 
  VI                                  738                    1451                    -40
Which of the above elements is likely to be : 
  1. the least reactive element.
  2. the most reactive metal.
  3. the most reactive non-metal.
Assign the position of the element having outer electronic configuration
  1. \(ns^ 2 np^ 4\) for \(n\) = \(3\) 
  2. \((n - 1)d^ 2 \;ns^ 2\) for \(n\) =\( 4\), and 
  3. \((n - 2) f ^7 (n - 1)d ^1 ns^ 2\) for \(n\) = \(6\), in the periodic table.
Which one of the following statements is incorrect in relation to ionization enthalpy?