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SSC CGL 2022 PYQ — Question 27

SSC CGL - 02 Dec 2022 - Shift 3 • General Awareness • Q27

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According to Mendeleev's periodic table, what was the atomic mass of Eka-aluminium which was later replaced by Gallium?

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Correct answer: C

Explanation

The correct answer is Option 3. i.e. 68.

  • The existence of gallium had been predicted in 1871 by Dmitri Mendeleev, the Russian chemist who published the first periodic table of the elements. 
  • Mendeleev noted a gap in his table and named the missing element "eka-aluminum" because he determined that its location was one place away from aluminum in the table.