1. The element Neon (Ne) consists of three isotopes with atomic masses as follows: 19.99 amu, 20.99 amu, and 21.99 amu. The relative abundances of these three
isotopes are 90.92%, 0.25%, and 8.83%, respectively. From this data, calculate
the average atomic mass of Neon.

geosphere and hydrosphere.

this is because the geosphere has to do with geological events, while the hydrosphere controls all water on earth.

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.