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UPSC Combined Geo-Scientist

Chemist

  • 3 descriptive papers
  • 200 marks each
  • 3 h per paper

Mains Paper I covers inorganic chemistry.

UPSC Combined Geo-Scientist, Mains · 2018 · Mains Paper I

Q2(a). Electron affinity trends; near-zero values for Be, Mg, Ca and N

Question

Define the electron affinity. Explain the general trends of electron affinity in the periodic table. Electron affinities of beryllium, magnesium, calcium and nitrogen are practically close to zero. Explain.

Model answer

The free solution for 2018 answers questions 1, 3, 4, 6, 8 and 11, the ones picked in its time plan. This part is not answered on the site yet. New answers are announced on Telegram.

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Coverselectron affinityperiodic trendshalf-filled configurationberyllium nitrogen

All parts of Question 2