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Chemistry

An element with atomic number 19 will most likely combine chemically with the elements whose atomic number is :

  1. 17
  2. 11
  3. 28
  4. 20

Periodic Table

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Answer

17

Reason — Element with atomic number 19 has an electronic configuration of 2, 8, 8, 1. It is a metal with one valence electron. Element with atomic number 17 has an electronic configuration of 2, 8, 7. It is a non-metal. Hence, element with atomic number 19 will donate its one valence electron to element with atomic number 17. Both will achieve stable octet. Hence, these two elements are most likely to combine chemically.

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