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NDA 2020 GAT · General Knowledge · Atomic Structure, Periodic Table and Bonding · easy

An element has electronic configuration 2, 8, 3. Its atomic number and nature are respectively

Single correct option

An element has electronic configuration 2, 8, 3. Its atomic number and nature are respectively
  1. A. 11 and metal
  2. B. 13 and metal
  3. C. 13 and non-metal
  4. D. 12 and metalloid
Show answer and solution

Answer: (B) 13 and metal

Adding the electrons, 2 + 8 + 3 = 13, which is the atomic number of aluminium. It has three valence electrons which it readily loses, so it is a metal in group 13. The trap is to count only valence electrons or choose non-metal on the basis of three outer electrons.
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Original question written in the NDA 2020 GAT pattern and checked twice for the correct answer. Not an official question paper. How we write and check questions · Corrections policy · Report a mistake