Download App

2. structure of atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistry2. structure of atom1 Mark
MCQ
What is the potential energy of the electron in the $L-$ shell of the hydrogen atom? .............. $\mathrm{eV}$
  • A
    $-13.6$
  • ✓
    $-6.8$
  • C
    $-10.2$
  • D
    $-3.4$
✓

Answer

Correct option: B.
$-6.8$
b
The principal quantum number for L-shell is 2 we know that energy of an electron in $\mathrm{nth}$ bohr's orbit is given by, $E_{n}=-\frac{13.6 \mathrm{eV}}{n^{2}}$

but Potential energy of electron $=-2\left(E_{n}\right)=-\frac{27.2 \mathrm{eV}}{n^{2}}$ Therefore, for $n=2$

$P.E. =-\frac{27.2 \mathrm{eV}}{4}=-6.8 \mathrm{eV}$

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "M.C.Q (1 Marks)" from 2. structure of atom→2. structure of atom — all question types→Chemistry STD 11 Science question papers→Gujarat Board STD 11 Science question papers→Gujarat Board question paper generator→

Similar questions

Complete combustion of $0.858\;g$ of compound $X$ gives $2.63\;g$ of $C{O_2}$ and $1.28\;g$ of ${H_2}O$. The lowest molecular mass $X$ can have ............ $\mathrm{g}$
→
Zirconium phosphate $[Zr_3 (PO_ 4)_4]$ dissociates into three zirconium cations of charge $+ 4$ and four phosphate anions of charge $- 3$. If molar solubility of zirconium phosphate is denoted by $S$ and its solubility product by $K_{sp}$ then which of the following relationship between $S$ and $K_{sp}$ is correct?
→
The salt having the least solubility in water is
→
Give the correct order of initials $T$ or $F$ for following statements. Use $T$ if  statement is true and $F$ if it is false :
$(I)$ The order of repulsion between different pair of electrons is $l_P - l_P > l_P - b_P > b_P - b_P$
$(II)$ In general, as the number of lone pair of electrons on central atom  increases, value of bond angle from normal bond angle also increases 
$(III)$ The number of lone pair on $O$ in $H_2O$ is $2$ while on $N$ in $NH_3$ is $1$
$(IV)$ The structures of xenon fluorides and xenon oxyfluorides could not be  explained on the basis of $VSEPR$ theory 
→
During any chemical change, the total mass of the products is equal to the total mass of reactants. This is a statement according to :
→
Examples of addition reactions include all but one of the following. Which is the odd one out?
→
Pentagonal bipyramidal structure contains bond angles approximately 
→
The ratio of the energy of the electrons in ground state of hydrogen to the electrons in first excited state of $Be^{3+}$ is :
→
The $pH $ of the solution containing $10\,ml$ of a $0.1\,N\,NaOH$ and $10\,ml$ of $0.05\,N$ ${H_2}S{O_4}$ would be
→
In the electrolytic method of obtaining aluminium from purified bauxite, cryolite is added to the charge in order to
→