Class 10 Exam > Class 10 Questions > An element has configuration 2, 8, 1. It belo...
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An element has configuration 2, 8, 1. It belongs to, _________.
- a)1 group and 3rd period
- b)3 group and 1st period
- c)1 group and 8th period
- d)17 group and 3rd period
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
An element has configuration 2, 8, 1. It belongs to, _________.a)1 gro...
No. of shells describe the no. of periods.
As the element has three shells(2,8,1) so, it belongs to 3rd period..
And the shell contains 1 electron (Valency 1) so, It belongs to 1 group.
As the element has three shells(2,8,1) so, it belongs to 3rd period..
And the shell contains 1 electron (Valency 1) so, It belongs to 1 group.
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An element has configuration 2, 8, 1. It belongs to, _________.a)1 gro...
The position of elements depends upon the number of valence electrons which depend upon the electronic configuration. Those elements which have same valence electrons occupysame group. Those elements which have onevalence electrons belong to group 1 elements,which have 2 valence electrons belong to group 2. Period number is equal to the number of shell.
Example:- Atomic number of Sodium (Na) is 11, so electronic configuration will be 2,8,1 as you had choosen the Option "A". Sodium has one valence electron in valence shell so it belongs to the group 1 as Sodium has three shells. So it belongs to 3rd period.
Example:- Atomic number of Sodium (Na) is 11, so electronic configuration will be 2,8,1 as you had choosen the Option "A". Sodium has one valence electron in valence shell so it belongs to the group 1 as Sodium has three shells. So it belongs to 3rd period.
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An element has configuration 2, 8, 1. It belongs to, _________.a)1 group and 3rd periodb)3 group and 1st periodc)1 group and 8th periodd)17 group and 3rd periodCorrect answer is option 'A'. Can you explain this answer?
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