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SSC CGL 2019 PYQ — Question 50

SSC CGL - 10th June 2019 - Shift 1 • General Awareness • Q50

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In his periodic table, Mendeleev could not assign a correct position to _________

Show answer & explanation

Correct answer: C

Explanation

The correct answer is option 3 i.e. Hydrogen.  

Mendeleev could NOT assign a correct position to_____.

Hydrogen 

Why?   
  • It is so because hydrogen has 1 valence electron in its outermost shell. So, according to the modern periodic table, hydrogen can be arranged in the halogen family i.e. group no. 17 but hydrogen does not possess the properties of the halogen family. 
  • Hydrogen resembles alkali metals as well as halogens.