JEE Mains · Chemistry · STD 12 - 4. d and f- block elements
The number of \(f\) electrons in the ground state electronic configuration of \(\mathrm{Np}(\mathrm{Z}=93)\) is ....... .
- A \(2\)
- B \(5\)
- C \(4\)
- D \(6\)
Answer & Solution
Correct Answer
(C) \(4\)
Step-by-step Solution
Detailed explanation
\(\mathrm{Np}=1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{~s}^{2} 3 \mathrm{p}^{6} 4 \mathrm{~s}^{2} 3 \mathrm{~d}^{10} 4 \mathrm{p}^{6} 5 \mathrm{~s}^{2} 4 \mathrm{~d}^{10} 5 \mathrm{p}^{6} 6 \mathrm{~s}^{2}\)…
See the Complete Solution
Get step-by-step explanations for this and 2.5 Lakh+ more JEE, NEET & CET questions.
- Unlock all solutions
- Practice the full chapter
- Track accuracy across PYQs
4.8 rated on Google Play · 14,000+ reviews
More questions from Chemistry
- Given below are two statements, one is labelled as Assertion \(A\) and the other is labelled as Reason \(R\) Assertion \(A :\)- Carbon forms two important oxides \(- CO\) and \(CO _2 . CO\) is neutral whereas \(CO _2\) is acidic in nature. Reason \(R :\)- \(CO _2\) can combine with water in a limited way to form carbonic acid, while \(CO\) is sparingly soluble in water. In the light of the above statements, choose the most appropriate answer from the options given below :-JEE Mains 2023 Medium
- An organic compound gives \(0.220 g\) of \(CO _2\) and \(0.126 g\) of \(H _2 O\) on complete combustion. If the \(\%\) of carbon is 24 then the \(\%\) hydrogen is \(......\times 10^{-1} \cdot(\) Nearest integer \()\)JEE Mains 2023 Hard
- A dipeptide, " \(x\) " on complete hydrolysis gives " \(y\) " and " \(z\) ". " \(y\) " on treatment with aq. \(\mathrm{HNO}_2\) produces lactic acid. On the other hand " \(z\) " on heating gives the following cyclic molecule.
Based on the information given, the dipeptide X is _______.JEE Mains 2025 Easy - The number of significant figures in \(50000.020 \times 10^{-3}\) is ..... .JEE Mains 2021 Medium
- Match List \(I\) with List \(II\).
Choose the correct answer from the options given below :-List \(I\) Isomeric pairs List \(II\) Type of isomers \(A\) Propanamine and \(N-\)Methylethanamine \(I\) Metamers \(B\) Hexan\(-2-\)one and Hexan\(-3-\)one \(II\) Positional isomers \(C\) Ethanamide and Hydroxyethanimine \(III\) Functional isomers \(D\) \(o-\)nitrophenol and \(p-\)nitrophenol \(IV\) Tautomers JEE Mains 2023 Hard - Choose the incorrect trend in the atomic radius \((\mathrm{r})\) of the elements :JEE Mains 2025 Easy
More PYQs from JEE Mains
- The Total pressure observed by mixing two liquid \(A\) and \(B\) is \(350\,mm\,Hg\) when their mole fractions are \(0.7\) and \(0.3\) respectively.The Total pressure becomes \(410 \,mm\,Hg\) if the mole fractions are changed to \(0.2\) and \(0.8\) respectively for \(A\) and \(B\). The vapour pressure of pure \(A\) is \(...........\,mm\,Hg\). (Nearest integer) Consider the liquids and solutions behave ideally.JEE Mains 2023 Medium
- Consider the following data:
\(\Delta_{f}H^{\Theta}(methane,g) = -X~kJ~mol^{-1}\)
Enthalpy of sublimation of graphite = \(Y~kJ~mol^{-1}\)
Dissociation enthalpy of \(H_{2} = Z~kJ~mol^{-1}\)
The bond enthalpy of C-H bond is given by:JEE Mains 2026 Medium - The density and breaking stress of a wire are \(6 \times\) \(10^4 \mathrm{~kg} / \mathrm{m}^3\) and \(1.2 \times 10^8 \mathrm{~N} / \mathrm{m}^2\) respectively. The wire is suspended from a rigid support on a planet where acceleration due to gravity is \(\frac{1^{\text {rd }}}{3}\) of the value on the surface of earth. The maximum length of the wire with breaking is _______ \(\mathrm{m}\) (take, \(\mathrm{g}=\) \(\left.10 \mathrm{~m} / \mathrm{s}^2\right)\)JEE Mains 2024 Hard
- The incorrect statement regarding ethyne is _______.JEE Mains 2024 Medium
- The correct increasing order for bond angles among \(\mathrm{BF}_3, \mathrm{PF}_3\) and \(\mathrm{C} l \mathrm{F}_3\) is _______.JEE Mains 2024 Medium
- When a certain amount of solid \(A\) is dissolved in \(100\,g\) of water at \(25^{\circ}\,C\) to make a dilute solution, the vapour pressure of the solution is reduced to one-half of that of pure water. The vapour pressure of pure water is \(23.76\,mm\,Hg\). The number of moles of solute \(A\) added is \(...........\) (Nearest Integer)JEE Mains 2022 Medium