List of top Chemistry Questions on Atomic Structure

The element with the highest third ionisation enthalpy is:
According to Molecular orbital theory, which of the following is correct with respect to bond order?

Match List-I with List-II. List-I contains quantum numbers and List-II contains orbitals. 

List-Inl
A21
B40
C53
D32


 

List-IIOrbital
I3d
II2p
III4s
IV5f
Which quantum number determines the shape of an orbital?
Which one of the following statements is not correct?
In which of the following, the number of bonding electrons and non-bonding electrons are in \(3:2\) ratio?
What is the maximum number of electrons that can be accommodated in a subshell with orbital angular momentum quantum number \(l = 3\)?
The molecule with expanded octet is
Which one of the following molecules has the lowest bond length (in pm)?
According to the law of triads, the properties of the middle element were in between those of the other two elements. This law was proposed by
Mendeleev called the undiscovered element after aluminium at his time as Eka-aluminium. What is the present name of the element after its discovery?
Which one of the following elements has the largest atomic radius?
The quantum number symbols are given in List-I and the informations about them are given in List-II. The correct match is}
Which one of the following is not isoelectronic with other isoelectronic species?
Chloride ion and potassium ion are isoelectronic. Then
The screening effect of d-electrons is
From the following pairs of ions which one is not an iso-electronic pair?
Bond order of $NO^+$ is
Find the value of \( n, \ell, m, \) and \( s \) for the 19th electron of a Cr atom.
If first ionization enthalpy of Mg is \(738 \, \text{kJ/mol\) then second ionization enthalpy of Mg in kJ/mol will be :

Assume internuclear axis to be z-axis, the correct molecular orbital representation of \(\pi^*\) antibonding molecular orbital formed by overlapping between two \(p\) orbitals will be: 

Which of the following have same radius according to Bohr's theory : (A) Radius of \(1^{st}\) orbit of H-atom.
(B) Radius of \(1^{st}\) orbit of He\(^{+}\).
(C) Radius of \(II^{nd}\) orbit of He\(^{2+}\).
(D) Radius of \(II^{nd}\) orbit of Li\(^{2+}\).
(E) Radius of \(II^{nd}\) orbit of Be\(^{3+}\).

Two atoms are bonding along the Z-axis. How will the \( \pi^* \) orbital look like (Z is the internuclear axis)? 

Anion \( X^- \) contains 45 neutrons and 36 electrons. The atomic mass, period number, and state in which "X" exists is:
How many of the following are paramagnetic:
Lu\(^{3+}\), Yb\(^{2+}\), Gd\(^{2+}\), Ce\(^{4+}\), La\(^{3+}\), Zn\(^{2+}\), Cu\(^{2+}\), Mn\(^{2+}\), Sc\(^{3+}\), and Ti\(^{4+}\)