1 FACT: Protection against whooping cough from early childhood vaccines may wear off, leaving adults and adolescents at risk for infection.  FACT: In China, whooping cough is known as the âcough of 100 daysâ due to the prolonged, dry cough that is experienced by infected individuals.
Which compound contains ionic bonds 1. CaO because Ca is a metal and O is a gas and all the other possibillities are gasses combined and ionic has a metal and gas combination if you look at the periodic table of el â¦ ements the right side is gases but they are determined by like a staircase and the rest are metals.
1 The elements in Na 2 O are a metal and a nonmetal, which form ionic bonds. 2  Because sodium is a metal and we recognize the formula for the phosphate ion (see Table 3.1 Some Polyatomic Ions), we know that this compound is ionic. However, polyatomic ions are held together by covalent bonds, so this compound contains both ionic and covalent bonds. 2  The elements in N 2 O 4 are both nonmetals, rather than a metal and a nonmetal. 3  Therefore, the atoms form covalent bonds.