Sodium metal burns in air according to the balanced reaction shown below. 4Na (x) + O2 → 2Na2O (g) How many grams of sodium are needed to produce 12.5 g of sodium oxide

a polar bond is formed when electrons are shared unevenly between atoms

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.

a is the correct answer