UPSC Exam > UPSC Questions > What is the number of valance electrons in th... Start Learning for Free
What is the number of valance electrons in the last element of 3rd period?
- a)7.0
- b)5.0
- c)8.0
- d)3.0
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
What is the number of valance electrons in the last element of 3rd per...
Understanding Valence Electrons in the 3rd Period
Valence electrons are the outermost electrons of an atom and play a crucial role in chemical bonding and reactivity. In the periodic table, elements are arranged in periods and groups based on their electron configuration.
Elements in the 3rd Period
- The 3rd period consists of the following elements:
- Sodium (Na)
- Magnesium (Mg)
- Aluminum (Al)
- Silicon (Si)
- Phosphorus (P)
- Sulfur (S)
- Chlorine (Cl)
- Argon (Ar)
Last Element of the 3rd Period
- The last element of the 3rd period is Argon (Ar).
- Argon is a noble gas, which means it has a complete outer electron shell.
Valence Electrons of Argon
- Argon has the electron configuration of [Ne] 3s² 3p⁶.
- This configuration indicates that Argon has a total of 8 valence electrons (2 in the 3s subshell and 6 in the 3p subshell).
Conclusion
- The correct answer to the question regarding the number of valence electrons in the last element of the 3rd period (Argon) is option 'C' (8.0).
- This completeness makes noble gases like Argon generally unreactive, as they do not tend to gain or lose electrons easily.
Understanding the valence electrons helps in predicting the behavior of elements in chemical reactions, particularly in the context of bonding and stability.
Valence electrons are the outermost electrons of an atom and play a crucial role in chemical bonding and reactivity. In the periodic table, elements are arranged in periods and groups based on their electron configuration.
Elements in the 3rd Period
- The 3rd period consists of the following elements:
- Sodium (Na)
- Magnesium (Mg)
- Aluminum (Al)
- Silicon (Si)
- Phosphorus (P)
- Sulfur (S)
- Chlorine (Cl)
- Argon (Ar)
Last Element of the 3rd Period
- The last element of the 3rd period is Argon (Ar).
- Argon is a noble gas, which means it has a complete outer electron shell.
Valence Electrons of Argon
- Argon has the electron configuration of [Ne] 3s² 3p⁶.
- This configuration indicates that Argon has a total of 8 valence electrons (2 in the 3s subshell and 6 in the 3p subshell).
Conclusion
- The correct answer to the question regarding the number of valence electrons in the last element of the 3rd period (Argon) is option 'C' (8.0).
- This completeness makes noble gases like Argon generally unreactive, as they do not tend to gain or lose electrons easily.
Understanding the valence electrons helps in predicting the behavior of elements in chemical reactions, particularly in the context of bonding and stability.
 | Explore Courses for UPSC exam |  |
Top Courses for UPSCView all
Top Courses for UPSC
Question Description
What is the number of valance electrons in the last element of 3rd period?a)7.0b)5.0c)8.0d)3.0Correct answer is option 'C'. Can you explain this answer? for UPSC 2026 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about What is the number of valance electrons in the last element of 3rd period?a)7.0b)5.0c)8.0d)3.0Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for UPSC 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the number of valance electrons in the last element of 3rd period?a)7.0b)5.0c)8.0d)3.0Correct answer is option 'C'. Can you explain this answer?.
What is the number of valance electrons in the last element of 3rd period?a)7.0b)5.0c)8.0d)3.0Correct answer is option 'C'. Can you explain this answer? for UPSC 2026 is part of UPSC preparation. The Question and answers have been prepared according to the UPSC exam syllabus. Information about What is the number of valance electrons in the last element of 3rd period?a)7.0b)5.0c)8.0d)3.0Correct answer is option 'C'. Can you explain this answer? covers all topics & solutions for UPSC 2026 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for What is the number of valance electrons in the last element of 3rd period?a)7.0b)5.0c)8.0d)3.0Correct answer is option 'C'. Can you explain this answer?.
Solutions for What is the number of valance electrons in the last element of 3rd period?a)7.0b)5.0c)8.0d)3.0Correct answer is option 'C'. Can you explain this answer? in English & in Hindi are available as part of our courses for UPSC. Download more important topics, notes, lectures and mock test series for UPSC Exam by signing up for free.
Here you can find the meaning of What is the number of valance electrons in the last element of 3rd period?a)7.0b)5.0c)8.0d)3.0Correct answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of What is the number of valance electrons in the last element of 3rd period?a)7.0b)5.0c)8.0d)3.0Correct answer is option 'C'. Can you explain this answer?, a detailed solution for What is the number of valance electrons in the last element of 3rd period?a)7.0b)5.0c)8.0d)3.0Correct answer is option 'C'. Can you explain this answer? has been provided alongside types of What is the number of valance electrons in the last element of 3rd period?a)7.0b)5.0c)8.0d)3.0Correct answer is option 'C'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice What is the number of valance electrons in the last element of 3rd period?a)7.0b)5.0c)8.0d)3.0Correct answer is option 'C'. Can you explain this answer? tests, examples and also practice UPSC tests.
| Explore Courses for UPSC exam | |
Top Courses for UPSC
Explore Courses
Signup for Free!
Signup to see your scores go up within 7 days! Learn & Practice with 1000+ FREE Notes, Videos & Tests.
