
Electronic configuration of Radium is?
a.) [Rn]$6{s^2}$
b.) [Rn] $7{s^2}$
c.) [Rn] $5{s^2}$
d.) [Rn] $6{s^1}$
Answer
154.8k+ views
Hint: The radium is the element from the 7th period and group 2. The group 1 and 2 involves the filling of s orbital while the 7th period indicates the filling of 7th shell. This element belongs to the beryllium family. So, it will have an electronic configuration similar to beryllium only with the difference in the outer shell only.
Complete step by step solution:
Let us know what electronic configuration is first.
The electronic configuration may be defined as the distribution of electrons of an atom or molecule in the atomic or molecular orbitals.
The electrons are filled on the basis of the Aufbau principle. It states that the electrons should be filled in atomic orbitals from lowest energy level to the higher ones.
The filling of electrons in atomic orbitals will give electronic configuration of radium as-
$1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}3{d^{10}}4{s^2}4{p^6}4{d^{10}}5{s^2}5{p^6}4{f^{14}}5{d^{10}}6{s^2}6{p^6}7{s^2}$
Writing the electronic configuration of higher elements like this is a tedious process. So, we write the name of nearest noble gas and then the electronic configuration of valence electrons.
The nearest noble gas to radium is radon which is written as- Rn.
The electronic configuration of radium this way can be written as- [Rn] $7{s^2}$
So, the option (B) is the correct answer.
Note: The easiest way to predict from above options is as-
We know that Radium belongs to the 7th period. So, the valence electrons of radium will be in the 7th shell only. Further, we know that it belongs to alkaline earth metals. So, in that case, s- orbital will be filled only and the s orbital can occupy a maximum of two electrons.
Complete step by step solution:
Let us know what electronic configuration is first.
The electronic configuration may be defined as the distribution of electrons of an atom or molecule in the atomic or molecular orbitals.
The electrons are filled on the basis of the Aufbau principle. It states that the electrons should be filled in atomic orbitals from lowest energy level to the higher ones.
The filling of electrons in atomic orbitals will give electronic configuration of radium as-
$1{s^2}2{s^2}2{p^6}3{s^2}3{p^6}3{d^{10}}4{s^2}4{p^6}4{d^{10}}5{s^2}5{p^6}4{f^{14}}5{d^{10}}6{s^2}6{p^6}7{s^2}$
Writing the electronic configuration of higher elements like this is a tedious process. So, we write the name of nearest noble gas and then the electronic configuration of valence electrons.
The nearest noble gas to radium is radon which is written as- Rn.
The electronic configuration of radium this way can be written as- [Rn] $7{s^2}$
So, the option (B) is the correct answer.
Note: The easiest way to predict from above options is as-
We know that Radium belongs to the 7th period. So, the valence electrons of radium will be in the 7th shell only. Further, we know that it belongs to alkaline earth metals. So, in that case, s- orbital will be filled only and the s orbital can occupy a maximum of two electrons.
Recently Updated Pages
JEE Atomic Structure and Chemical Bonding important Concepts and Tips

JEE Amino Acids and Peptides Important Concepts and Tips for Exam Preparation

JEE Electricity and Magnetism Important Concepts and Tips for Exam Preparation

Chemical Properties of Hydrogen - Important Concepts for JEE Exam Preparation

JEE Energetics Important Concepts and Tips for Exam Preparation

JEE Isolation, Preparation and Properties of Non-metals Important Concepts and Tips for Exam Preparation

Trending doubts
JEE Main 2025 Session 2: Application Form (Out), Exam Dates (Released), Eligibility, & More

JEE Main 2025: Derivation of Equation of Trajectory in Physics

Electric Field Due to Uniformly Charged Ring for JEE Main 2025 - Formula and Derivation

NH4NO3 and NH4NO2 on heating decomposes in to A NO2 class 11 chemistry JEE_Main

Degree of Dissociation and Its Formula With Solved Example for JEE

Displacement-Time Graph and Velocity-Time Graph for JEE

Other Pages
JEE Advanced Marks vs Ranks 2025: Understanding Category-wise Qualifying Marks and Previous Year Cut-offs

JEE Advanced 2025: Dates, Registration, Syllabus, Eligibility Criteria and More

JEE Advanced Weightage 2025 Chapter-Wise for Physics, Maths and Chemistry

NCERT Solutions for Class 11 Chemistry In Hindi Chapter 1 Some Basic Concepts of Chemistry

JEE Advanced 2025 Notes

Electrical Field of Charged Spherical Shell - JEE
