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JAMB Chemistry 2014 Question 6

Question 6

Periodic Table

An element X has electron configuration 1s2 2s2 2p6 3s2 3p5. Which of the following statements is correct about the element?

  1. A.It has a completely filled p-orbital.
  2. B.It has 5 electrons in its outermost shell.
  3. C.It belongs to group II on the periodic table.
  4. D.It is a halogen.
Show the answer and explanation

Answer: D (It is a halogen.)

Explanation

X has 7 outer electrons (3s2 3p5), so it is in group VII: it is chlorine, a halogen.