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JAMB Chemistry 2009 Question 7

Question 7

Atomic Structure

If an atom is represented as 2311X, which of the following deductions is correct?

  1. A.It contains 12 protons
  2. B.It forms a covalent chloride
  3. C.Its atomic number is 23
  4. D.It is an alkali metal
Show the answer and explanation

Answer: D (It is an alkali metal)

Explanation

Atomic number 11 is sodium (2,8,1), a group 1 alkali metal. It has 11 protons and 12 neutrons.