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NEET levelSingle correct optionDifficulty 1 of 3pt193

Going from left to right across the third period (Na to Cl), the electronegativity generally

  1. Adecreases because atomic size increases
  2. Bincreases because the effective nuclear charge increases and atomic size decreases
  3. Cremains constant because the shell number is the same
  4. Dfirst decreases and then increases

Answer: B

Across a period the shell number stays fixed while nuclear charge increases. The effective nuclear charge felt by bonding electrons grows and the radius shrinks, so the atom attracts the shared pair more strongly and electronegativity increases.
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