The configuration $1s^2 2s^2 2p^5 3s^1$ shows

  • A
    Ground state of fluorine atom
  • B
    Excited state of fluorine atom
  • C
    Excited state of neon atom
  • D
    Excited state of ion $O_2^-$

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Similar Questions

The correct ground state electronic configuration of chromium atom is

The atomic numbers of elements $X, Y$ and $Z$ are $19, 21$ and $25$ respectively. The number of electrons present in the $M$-shell of these elements follow the order:

Write information about the four quantum numbers.

Two electrons $A$ and $B$ in an atom have the following set of quantum numbers:
$A: n=3, l=2, m_l=-2, m_s=+1/2$
$B: n=3, l=0, m_l=0, m_s=+1/2$
What is true for $A$ and $B$?

An electron has a spin quantum number $+1/2$ and magnetic quantum number $-1.$ It cannot be present in :

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