JAMB Chemistry 2009 Objective — Question 7
Question 7 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2009 Objective paper, with the correct answer and a full explanation.
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If an atom is represented as X, which of the following deductions is correct?
- A. It contains 12 protons
- B. It forms a covalent chloride
- C. Its atomic number is 23
- D. It is an alkali metalCorrect
Explanation
X has (i) an atomic number of 11 (ii) a mass number of 23 (iii) 11 protons (iv) 11 electrons (v) 23-11=12 neutrons. Since it has 11 electrons, the structure is 2,8,1. Thus, it is a group 1 metal. Group 1 metals are also called alkali metals.
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