Description Homework #3 1. Which pairs of elements are likely to form ionic bonds (I) and which pairs are likely to form covalent bonds (C)? a. Carbon and hydrogen _____ b. Sodium and sulfur _____ c. Hydrogen and oxygen _____ d. Magnesium and bromine _____ 2. Positively charged ions are called _______________________ and negatively charged ions are called ______________________________ 3. When the following atoms become ions what charges do they acquire? a. Li _____ b. S _____ c. Ca _____ d. F _____ 4. Write the ion symbol for the atom with the given number of protons and electrons. 5. What element fits each description? a. Four protons and two electrons ______ b. 22 protons and 20 electrons _____ c. 16 protons and 18 electrons _____ d. 13 protons and 10 electrons _____ a. A period 2 element that forms a +2 cation _____ b. An ion from group 7A with 18 electrons ______ c. A cation from group 1A with 36 electrons _____ 6. What a. b. c. d. 7. Write a. b. c. d. e. noble gas has the same electronic configuration as each ion? O2- _____ Mg2+ _____ S2- _____ Cl- _____ the chemical formula for an ionic compound composed of each pair of ions. the sodium ion and the sulfur ion _______________________ the aluminum ion and the fluoride ion ___________________ the 3+ iron ion and the oxygen ion ______________________ the calcium ion and the nitrate ion ______________________ the magnesium ion and the carbonate ion _________________ 8. The recommended dietary allowance for calcium for teenage children is 1,300 mg per day. If a typical 8.0-fl oz glass of reduced-fat milk contains 298 mg of calcium, how many fluid ounces of milk does a teenager need to drink to get the entire recommended amount of calcium from this milk?