An element Q has three naturally occurring isotopes. One of the isotopes has a mass of 20amu and an abundance of 90.48%, the second has a mass of 21amu and abundance of 0.27% and the third has a mass of 22amu. Calculate the percentage abundance of the third isotope.
Calculate the relative atomic mass of element Q

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.