JAMB Chemistry 2011 Objective — Question 12

Question 12 of 49 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2011 Objective paper, with the correct answer and a full explanation.

What type of bond exists between an element X with atomic number 12 and Y with atomic number 17?

A. A. Dative
B. B. ElectrovalentCorrect
C. C. Metallic
D. D. Covalent

Explanation

X=12X (2,8,2); Y=17Y (2,8,7). To attain octet, X loses two electrons while Y gains an electron, so two atoms of Y combine with one atom of X. The bonding type involving transfer of electrons is electrovalent bond.

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