Describe what happens when an atom of potassium and iodine react to produce potassium iodide.Answer in terms of electrons.The iodine atom loses one electron to form a positive ion (I+). This electron is transferred to a potassium atom.The potassium atom gains one electron to form a negative ion (K-).The positive iodide ion and the negative potassium ion electrostatically attract, forming an ionic bond.The potassium ion loses one electron to form a positive ion (K+). This electron is transferred to an iodine atom.The iodine ion gains one electron to form a negative ion (I-).The positive potassium ion and the negative iodine ion electrostatically attract, forming an ionic bond.The potassium atom loses one electron to form a positive ion (K+). This electron is transferred to an iodine atom.The iodine atom gains one electron to form a negative ion (I-).The positive potassium ion and the negative iodide ion electrostatically attract, forming an ionic bond.The iodine atom loses one electron to form a negative ion (I-). This electron is transferred to a potassium atom.The potassium atom gains one electron to form a positive ion (K+).The positive potassium ion and the negative iodine ion electrostatically attract, forming an ionic bond.

(b) Magnesium iodide can be made by reacting magnesium with iodine. Mg + I2 → MgI2 Magnesium iodide is an ionic compound. It contains magnesium ions (Mg 2+ ) and iodide ions (I -). Describe, in terms of electrons, what happens when magnesium reacts with iodine.

The diagram below shows the reaction between potassium and bromine.Describe, in terms of electrons, what happens when a potassium atom reacts with a bromine atom to produce potassium bromide.Potassium will lose one electron to form a -1 ion.Bromine will gain one electron to form a +1 ion.The oppositely charged ions are then held together by a strong electrostatic attraction.Potassium will gain one electron to form a -1 ion.Bromine will gain one electron to form a +1 ion.The oppositely charged ions are then held together by a strong electrostatic attraction.Potassium will lose one electron to form a +1 ion.Bromine will gain one electron to form a -1 ion.The oppositely charged ions are then held together by a strong electrostatic attraction.Potassium will gain one electron to form a +1 ion.Bromine will lose one electron to form a -1 ion.The oppositely charged ions are then held together by a strong electrostatic attraction.

By observing the Bohr Models for the elements Potassium and Nitrogen below, Potassium has  valence electron(s) and Nitrogen has  valence electron(s). If these two substances were form an ionic bond in a chemical reaction, the resulting chemical formula for the substance produced (Potassium Nitride) would have  Potassium atom(s) and  Nitrogen atom(s).

b) Chlorine reacts with aqueous potassium iodide in a displacement reaction.Cl2 (aq) + 2I– (aq) 2Cl – (aq) + I2 (aq)(i) Explain, in terms of electrons, why chlorine is an oxidising agent in this reaction................................................................................................................................................................................................................................................................................. [1](ii) State the oxidation number of iodine in I2 .

Chlorine and iodine undergo similar reactions.Which one of the following explains why chlorine and iodine react similarly?Chlorine and iodine both have the same relative atomic mass. The relative atomic mass determines how atoms will react.Chlorine and iodine both have the same atomic number. The atomic number determines how atoms will react.Chlorine and iodine both have 7 protons on their outer shell. The number of protons on the outer shell determines how atoms will react.Chlorine and iodine both have 7 electrons on their outer shell. The number of electrons on the outer shell determines how atoms will react.