Question

ii) Which of the following can change to an anion? a) lodine b) Magnesium c) Calcium d) Xenon ​

Answer 1

The correct option is a.

• The species which contain a negative charge called anion and the species which contain a positive charge called cation.
• Iodine is a halogen.Iodine forms $I^-$ anion.
• Magnesium is an alkaline earth metal. Magnesium forms $Mg^+$ cation.
• Calcium is an alkaline earth metal. Calcium forms $Ca^{+2}$ cation.
• Xenon is an inert gas.Xenon forms $Xe^+$ cation.

Answer 2

The correct answer to the above question is (a), which is iodine.

• Anion is charged particle and is a negatively charged ion, and it is attracted to the anode of the electrode during electrolysis.
• Anion is formed by the gain of electrons. Non-metal gain electrons, because they have one or two-electron less than its stable configuration.
• From the question, Magnesium, Calcium are metals. They lose electrons to form a stable configuration.
• Magnesium loses two-electron to form Mg²⁺ and calcium also loses two-electron to form Ca ²⁺.
• Xenon is a noble gas, neither lose nor gain electron at normal condition.
• Iodine is a non-metal, and it has seven electrons in its outer shell. So to have a stable electron configuration it needs only one electron. So it forms I⁻ anion.