Download App

Structure of Atom — Chemistry STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceChemistryStructure of Atom3 Marks
Question
Calculate the energy required for the process,
$\text{He}^+(\text{g})\rightarrow\text{He}^{2+}\text{(g)}+\text{e}^-$
The ionization energy for the H atom in the ground state is $2.18 \times 10^{-18} \mathrm{~J}\mathrm{~atom}^{-1}$
✓

Answer

Energy associated with hydrogen-like species is given by,
$\text{E}_{\text{n}}=-2.18\times10^{-18}\Big(\frac{\text{Z}^2}{\text{n}^2}\Big)\text{J}$
For ground state of hydrogen atom,
$\triangle\text{E = E}_{\infty}-\text{E}_1$
$=0-\bigg[-2.18\times10^{-18}\bigg\{\frac{(1)^2}{(1)^2}\bigg\}\bigg]\text{J}$
$\triangle\text{E}=2.18\times10^{-18}\text{J}$
For the given process,
$\text{He}^+(\text{g})\rightarrow\text{He}^{2+}\text{(g)}+\text{e}^-$
An electron is removed from $\text{n}=1\text{ to}\text{ n}=\infty.$
$\triangle\text{E = E}_{\infty}-\text{E}_1$
$=0-\bigg[-2.18\times10^{-18}\bigg\{\frac{(2)^2}{(1)^2}\bigg\}\bigg]$
$\triangle\text{E}=8.27\times10^{-18}\text{J}$
$\therefore$ The energy required for the process $8.27\times10^{-18}\text{J}.$

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 "3 Marks Question" from Structure of Atom→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

A compound of alkaline earth metals 'A' gives basic oxide 'B' as well as acidic oxide 'C'. The basic oxide is soluble in water and becomes milky when 'C' is passed through it. Identify 'A', 'B' and 'C'.
→
For your agricultural field or garden you have developed a compost producing pit. Discuss the process in the light of bad odour, flies and recycling of wastes for a good produce.
→
In both water and dimethyl ether oxygen atom is central atom, and has the same hybridisation, yet they have different bond angles. Which one has greater bond angle? Give reason.
→
Explain why HCl is a gas and HF is a liquid.
→
Calculate the wavelength of the spectral line obtained in the spectrum of $Li^{2+}$ ion when the transition takes place between two levels whose sum is 4 and the difference is 2.
→
  1. Name the different salts that cause permanent hardness of water.
  2. How do we obtain demineralised water from hard water after passing it from synthetic ion exchange resins? Give reactions.
→
A vessel contains 1.6g of dioxygen at STP ($273.15K, 1$ atm pressure). The gas is now transferred to another vessel at constant temperature, where pressure becomes half of the original pressure. Calculate
  1. Volume of the new vessel.
  2. Number of molecules of dioxygen.
→
For the reaction,
$2 \mathrm{Cl}(\mathrm{g}) \rightarrow \mathrm{Cl}_2(\mathrm{g})$, what are the signs of $\Delta\text{H}$ and $\Delta\text{S}?$
→
The first (IE) and second (IER) ionization enthalpy: $\left( KJ mol ^{-1}\right)$ of three elements $A , B$ and C are given below:
 ABC
$IE _1$4035491142
$IE _2$264010602080
Identify the element which is likely to be
i. a non-metal
ii. an alkali metal
iii. an alkaline earth metal
→
Write the important conditions required for the linear combination of atomic orbitals to form molecular orbitals.
→