
The ionization energy of is equal to:
(A)
(B)
(C)
(D)
Answer
425.4k+ views
Hint :Ionization energy is the energy required to remove an electron from the given atom or ion. This is usually expressed in .
Lithium has 3 electrons in total. means that 2 of those 3 electrons are already lost and thus forms a cation. We need to find out the energy needed to remove that last electron from the given cation. We are also asked to express this in terms of .
We all know that Energy is given by
Where is energy
is the Plank’s constant. It has a value of
is the speed of light. It has a value of
is the wavelength
We can find the value of for this question from Rydberg’s formula. It is given by;
is known as the Rydberg’s constant. It has a value of
Here is the atomic number
is the initial energy state
is the final energy state.
Complete Step By Step Answer:
We are asked to find the ionization energy of . This means that we can apply Rydberg’s formula and find from it. This can be substituted in equation (1) to find out the energy.
Since we are talking about ionisation from the first energy level of , we have to consider the value of as 1 and that of as .
We also know that the atomic number of Lithium is 3
Substituting these in the Rydberg’s equation we get:
Since is equal to zero, we can rewrite the equation as:
Substituting these values into equation (1) we get
Hence we can say that the correct option for this question is (A).
Note :
We can substitute the values of and find out the value of ionization energy of to be
Using Rydberg’s formula we can also be used to find out the wavelength of different spectral lines that arise due to transitions between different energy levels.
They are widely known as Lyman, Balmer, Paschen, Brackett, Pfund.
Lithium has 3 electrons in total.
We all know that Energy is given by
Where
We can find the value of
Here
Complete Step By Step Answer:
We are asked to find the ionization energy of
Since we are talking about ionisation from the first energy level of
We also know that the atomic number of Lithium is 3
Substituting these in the Rydberg’s equation we get:
Since
Substituting these values into equation (1) we get
Hence we can say that the correct option for this question is (A).
Note :
We can substitute the values of
Using Rydberg’s formula we can also be used to find out the wavelength of different spectral lines that arise due to transitions between different energy levels.
They are widely known as Lyman, Balmer, Paschen, Brackett, Pfund.
Latest Vedantu courses for you
Grade 11 Science PCM | CBSE | SCHOOL | English
CBSE (2025-26)
School Full course for CBSE students
₹41,848 per year
Recently Updated Pages
Master Class 11 Accountancy: Engaging Questions & Answers for Success

Master Class 11 Social Science: Engaging Questions & Answers for Success

Master Class 11 Economics: Engaging Questions & Answers for Success

Master Class 11 Physics: Engaging Questions & Answers for Success

Master Class 11 Biology: Engaging Questions & Answers for Success

Class 11 Question and Answer - Your Ultimate Solutions Guide

Trending doubts
1 ton equals to A 100 kg B 1000 kg C 10 kg D 10000 class 11 physics CBSE

One Metric ton is equal to kg A 10000 B 1000 C 100 class 11 physics CBSE

How much is 23 kg in pounds class 11 chemistry CBSE

Difference Between Prokaryotic Cells and Eukaryotic Cells

Which one is a true fish A Jellyfish B Starfish C Dogfish class 11 biology CBSE

What is the technique used to separate the components class 11 chemistry CBSE
