Mock Test 1 — Structure of Atom

The maximum number of electrons in the third shell:

Energy required to remove the electron from $H$ atom in ground state:

In hydrogen, Balmer series gives:

Two electrons in the same orbital must have:

Number of unpaired electrons in $Cr$ ($Z = 24$):

Wavelength of an electron accelerated by $100$ V:

The orbital $4d$ has:

The number of spectral lines from $n = 5$ to ground state:

The ratio of radius of 2nd Bohr orbit of He⁺ to 1st of H:

Number of orbitals associated with $n = 4$:

Maximum number of electrons that $5g$-subshell can hold (if it existed) given $l$ = 4. Then $2(2l+1) =$:

Number of unpaired electrons in $Mn^{2+}$ ($Z(Mn) = 25$):

Total number of nodes in $3d$ orbital:

Assertion (A): Half-filled and fully-filled configurations are extra stable. Reason (R): They have greater exchange energy and symmetrical electron distribution.

Assertion (A): The fourth quantum number $m_s$ does not come from Schrödinger's equation. Reason (R): Electron spin is an intrinsic property added empirically.