Which statement is not true regarding the $2s$ orbital?

  • A
    Number of radial nodes is greater than zero
  • B
    Angular nodes is equal to zero
  • C
    $\Psi \left( \theta, \phi \right) = \text{constant}$
  • D
    Probability density is zero at the nucleus

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The number of radial (spherical) nodes in a $4p$ orbital is $....$.

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Explain $d$ orbital.

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Identify the correct statements among the following:
$i. E_{2s}(H) > E_{2s}(Li) < E_{2s}(Na) > E_{2s}(K)$
$ii.$ The maximum number of electrons in the shell with principal quantum number $n$ is equal to $2n^2$.
$iii.$ Extra stability of half-filled subshell is due to smaller exchange energy.
$iv.$ Only two electrons,irrespective of their spin,may exist in the same orbital.

Assertion : An orbital designated by $n = 3, l = 1$ has double dumb-bell shape.
Reason : It belongs to $p-$subshell.

From the given sets of quantum numbers,the one that is inconsistent with the theory is:

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