-
Engineering and Architecture
Exams
Colleges
Predictors
Resources
-
Computer Application and IT
Quick Links
Colleges
-
Pharmacy
Colleges
Resources
-
Hospitality and Tourism
Colleges
Resources
Diploma Colleges
-
Competition
Other Exams
Resources
-
School
Exams
Top Schools
Products & Resources
-
Study Abroad
Top Countries
Resources
-
Arts, Commerce & Sciences
Colleges
Upcoming Events
Resources
-
Management and Business Administration
Exams
Colleges & Courses
Predictors
-
Learn
Law Preparation
MBA Preparation
Engineering Preparation
Medical Preparation
-
Online Courses and Certifications
Top Streams
Specializations
- Digital Marketing Certification Courses
- Cyber Security Certification Courses
- Artificial Intelligence Certification Courses
- Business Analytics Certification Courses
- Data Science Certification Courses
- Cloud Computing Certification Courses
- Machine Learning Certification Courses
- View All Certification Courses
Resources
-
Medicine and Allied Sciences
Colleges
Predictors
Resources
-
Law
Resources
Colleges
-
Animation and Design
Exams
Predictors & Articles
Colleges
Resources
-
Media, Mass Communication and Journalism
Colleges
Resources
-
Finance & Accounts
Top Courses & Careers
Colleges
Get Answers to all your Questions
- #Class 11
- #Chemistry
- #National Eligibility Cum Entrance Test
- #s- Block Elements ( Alkali and Alkaline earth metals )
- #National Eligilibility Cum Entrance Test
- #Medical
Mark the correct order of reactivity of Group 1 elements.
Li < K < Na < Rb < Cs
Na < Li < K < Rb < Cs
Li < K < Na < Rb < Cs
Li < Na < K < Cs < Rb
Answers (1)
Group 1 elements belong to s-block with general electronic configuration ns1.
Since, they have only 1 valence shell electron, they tend to readily lose it to attain the noble gas configuration. On moving down group 1, the ionization enthalpies decrease due to their very large atomic size, as a result of which the valence s electron can be readily removed. Ionisation energy of alkali metals decrease as we move down the group because of decrease in the magnitude of force of attraction with the nucleus on account of increased atomic radii & magnitude of screening effect Thus, the order of reactivity among group 1 elements is as follows:
Li < Na < K < Rb < Cs
NEET 2024 Most scoring concepts
- Just Study 32% of the NEET syllabus and Score up to 100% marks
