What is meant by the electronegativity of an element? How does the electronegativity of Group 1 elements in the long periodic table change from top to bottom? [1+2]
WBBSE
Class X
Physical Science
Periodic Table
03 Mark
2026
Electronegativity is the tendency of an atom in a molecule to attract the shared pair of electrons towards itself.
In Group 1, electronegativity decreases from top to bottom. This is because down the group the atomic size increases. The attraction of the nucleus for the shared pair of electrons decreases.
Hence, Li > Na > K > Rb > Cs
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