Please help me with this assignment. Thank you.

3. Arrange the following bonds in order of decreasing polarity, by placing a number from 1 to 5 in each space: , 00 HF, 1 CI. Cs Au 4. lodine is an essential element for human health. Iodine deficiency causes a condition called goitre, which is an enlargement of the thyroid gland. To help prevent goitre, the table salt we use often contains iodine in the form of sodium iodide. What is the electronegativity difference between sodium and iodine? Is sodium iodide an ionic or covalent compound? What is its chemical formula? AEN Ionic or covalent? Chemical formula