Determine whether or not each element is a main-group element.
Solution : Step 1: Here we need to identify which compounds are molecular and ionic among the given compounds. So first let’s see what is a molecular compound and ionic compound and then we identify the compounds. Step 2 : An ionic compound is a substance formed from the chemical binding of elements with opposite charges. The force of attraction between opposite charges keeps the molecule together. Simply put, Ionic compounds are generally combinations of metals and nonmetals where cations are metal ions and anions are nonmetal ions. Example : Common table salt or Sodium chloride(NaCl), Silver iodide(AgI) . A molecular compound can be defined as a compound where the atoms share electrons through covalent bonds. It is also known as a covalent compound. Molecular compounds are made up of two or more non-metals. Example : 1. Water, its molecular formula is : H 2 2. Ammonia is expressed in molecular formula as : NH 3