Ionic bonding in magnesium oxide
2 marks · HardState the ion formed when a magnesium atom loses electrons, and give its charge. What type of ion is this called?
Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.
Show answer
The ion formed is Mg^{2+}, with a charge of 2+. This is called a cation.
Must show: Mg^{2+}, charge of 2+, cation
Also accept: "Magnesium ion (Mg^{2+}), 2+, cation" is accepted in any order
Common mistakes: Omitting type of ion; Giving wrong charge
Show mark scheme and worked solution
Marking points
B1 · 1 mark · Identifies correct ion as Mg^{2+} and gives charge as 2+.
B2 · 1 mark · Gives type of ion as cation (or correctly defines as a positively charged ion).
Worked solution
A magnesium atom loses two electrons to form Mg^{2+} ion, which carries a 2+ charge. This is called a cation.