UPSC Exam > UPSC Questions > The no. of electrons in the valence shells of... Start Learning for Free
The no. of electrons in the valence shells of Sodium and Calcium repectively:
- a)1, 1
- b)2, 1
- c)1, 2
- d)2, 2
Correct answer is option 'C'. Can you explain this answer?
Verified Answer
The no. of electrons in the valence shells of Sodium and Calcium repec...
Electronic configuration of
Na is 2, 8, 1
Ca is 2, 8, 8, 2
Most Upvoted Answer
The no. of electrons in the valence shells of Sodium and Calcium repec...
Sodium has atomic no. 11 and it's electronic configuration 2,8,1 means in last shell contain one electron and calcium has atomic no.17 it's electronic configuration 2,8,2 means in last shell contain two electron that's why right answer is c.
Free Test
FREE
| Start Free Test |
Community Answer
The no. of electrons in the valence shells of Sodium and Calcium repec...
Understanding Valence Electrons
Valence electrons are the electrons located in the outermost shell of an atom. They play a crucial role in chemical bonding and reactions.
Sodium (Na) Characteristics
- Sodium is located in Group 1 of the periodic table.
- It has an atomic number of 11, meaning it has 11 electrons in total.
- The electron configuration is 1s2 2s2 2p6 3s1.
- Valence Electrons: Sodium has 1 electron in its outermost shell (3s orbital).
Calcium (Ca) Characteristics
- Calcium is located in Group 2 of the periodic table.
- It has an atomic number of 20, which means it has 20 electrons.
- The electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2.
- Valence Electrons: Calcium has 2 electrons in its outermost shell (4s orbital).
Conclusion
- The number of valence electrons in Sodium is 1.
- The number of valence electrons in Calcium is 2.
Correct Answer
Thus, the correct option is C) 1, 2. Sodium has 1 valence electron and Calcium has 2 valence electrons, which helps explain their reactivity and the types of bonds they can form.
Valence electrons are the electrons located in the outermost shell of an atom. They play a crucial role in chemical bonding and reactions.
Sodium (Na) Characteristics
- Sodium is located in Group 1 of the periodic table.
- It has an atomic number of 11, meaning it has 11 electrons in total.
- The electron configuration is 1s2 2s2 2p6 3s1.
- Valence Electrons: Sodium has 1 electron in its outermost shell (3s orbital).
Calcium (Ca) Characteristics
- Calcium is located in Group 2 of the periodic table.
- It has an atomic number of 20, which means it has 20 electrons.
- The electron configuration is 1s2 2s2 2p6 3s2 3p6 4s2.
- Valence Electrons: Calcium has 2 electrons in its outermost shell (4s orbital).
Conclusion
- The number of valence electrons in Sodium is 1.
- The number of valence electrons in Calcium is 2.
Correct Answer
Thus, the correct option is C) 1, 2. Sodium has 1 valence electron and Calcium has 2 valence electrons, which helps explain their reactivity and the types of bonds they can form.
 | Explore Courses for UPSC exam |  |
Top Courses for UPSCView all
Top Courses for UPSC
Question Description
The no. of electrons in the valence shells of Sodium and Calcium repectively:a)1, 1b)2, 1c)1, 2d)2, 2Correct 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 The no. of electrons in the valence shells of Sodium and Calcium repectively:a)1, 1b)2, 1c)1, 2d)2, 2Correct 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 The no. of electrons in the valence shells of Sodium and Calcium repectively:a)1, 1b)2, 1c)1, 2d)2, 2Correct answer is option 'C'. Can you explain this answer?.
The no. of electrons in the valence shells of Sodium and Calcium repectively:a)1, 1b)2, 1c)1, 2d)2, 2Correct 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 The no. of electrons in the valence shells of Sodium and Calcium repectively:a)1, 1b)2, 1c)1, 2d)2, 2Correct 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 The no. of electrons in the valence shells of Sodium and Calcium repectively:a)1, 1b)2, 1c)1, 2d)2, 2Correct answer is option 'C'. Can you explain this answer?.
Solutions for The no. of electrons in the valence shells of Sodium and Calcium repectively:a)1, 1b)2, 1c)1, 2d)2, 2Correct 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 The no. of electrons in the valence shells of Sodium and Calcium repectively:a)1, 1b)2, 1c)1, 2d)2, 2Correct answer is option 'C'. Can you explain this answer? defined & explained in the simplest way possible. Besides giving the explanation of The no. of electrons in the valence shells of Sodium and Calcium repectively:a)1, 1b)2, 1c)1, 2d)2, 2Correct answer is option 'C'. Can you explain this answer?, a detailed solution for The no. of electrons in the valence shells of Sodium and Calcium repectively:a)1, 1b)2, 1c)1, 2d)2, 2Correct answer is option 'C'. Can you explain this answer? has been provided alongside types of The no. of electrons in the valence shells of Sodium and Calcium repectively:a)1, 1b)2, 1c)1, 2d)2, 2Correct answer is option 'C'. Can you explain this answer? theory, EduRev gives you an ample number of questions to practice The no. of electrons in the valence shells of Sodium and Calcium repectively:a)1, 1b)2, 1c)1, 2d)2, 2Correct 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.
