MCQ
Which of the following options does not represent ground state electronic configuration of an atom?
- A1s2 2s2 2p6 3s2 3p6 3d8 4s2.
- B1s2 2s2 2p6 3s2 3p6 3d9 4s2.
- C1s2 2s2 2p6 3s2 3p6 3d10 4s1.
- D1s2 2s2 2p6 3s2 3p6 3d5 4s1.
✓
Answer
- 1s2 2s2 2p6 3s2 3p6 3d9 4s2.
Explanation:
Correct electronic configuration of the two subshells (3d and 4s) should be 3d10 4s1.
In certain elements such as Cu or Cr, where the two subshells (4s and 3d) differ slightly in.
Need a full question paper?
Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.
Explore more
Similar questions
The $pK_a$ value in $H_2O$ of picric acid, acetic acid and phenol are in the order
→Which of the following statements about the interstitial compounds is incorrect?
The correct order of bond angles (smallest first) in ${H_2}S,N{H_3},B{F_3}$ and $Si{H_4}$ is
→A stream of electrons from a heated filaments was passed two charged plates kept at a potential difference $V\, esu.$ If $e$ and $m$ are charge and mass of an electron, respectively, then the value of $h/\lambda ,$ (where $\lambda$ is wavelength associated with electron wave) is given by :
→Total number of secondary amines (Excluding stereo isomer) possible with the molecular formula $C_5H_{13}N$ is
→Product obtained when benzoyl acetic acid is heated with soda-lime is :
Consider the following compounds in the liquid form :
→$O _2, HF , H _2 O , NH _3, H _2 O _2, CCl _4, CHCl _3, C _6 H _6, C _6 H _5 Cl \text {. }$
When a charged comb is brought near their flowing stream, how many of them show deflection as per the following figure?
One mole of a non-ideal gas undergoes a change of state ($2.0\, atm$, $3.0\, L$ , $95 \,K$ ) $\rightarrow $($4.0\, atm$ , $5.0\, L$ , $245\, K )$ with a change in internal energy, $\Delta U =30.0 \,L$ $atm$. The change in enthalpy $\Delta H$ of the process in $L\,atm$ is.
→The element with configuration 1s2, 2s2, 2p6, 3s2 would be:
Consider the following flow diagram :-
→Compound $X$ and $Y$ are respectively.