Question

An element \(_{13}X^{27}\) forms ionic compound. What is the charge on \(X\) in ionic compound:

• A. +1
• B. +2
• C. +3
• D. +4

Answer 1

The Correct Option is C

The notation $_{13}^{27}X$ tells us that the element X has an atomic number of 13. The atomic number corresponds to the number of protons and, in a neutral atom, also the number of electrons. Element 13 is aluminum (Al). 

Aluminum is in group 13 of the periodic table. Elements in group 13 have 3 valence electrons. To achieve a stable electron configuration, aluminum tends to lose these 3 valence electrons. When an atom loses electrons, it becomes a positively charged ion (a cation). 

Since aluminum loses 3 electrons, its charge becomes +3.