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What is the valency of an element with electronic configuration 2, 8, 3?
AThree
BTwo
CFive
DEight
Answer & Solution
Correct answer: A. Three
1. The element has 3 electrons in the outermost shell.
2. Valency for groups 1-2 and 13 is the number of valence electrons.
3. With 3 valence electrons, the element gives a valency of 3.
4. So the valency is three.
5. The element is aluminium with atomic number 13.
_Source: NCERT Class 10 Science Ch 5 'Periodic Classification of Elements'_
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