Answer:
Yes , it is due to gravity , structure of earth,air resistance so ...
All of these EXCEPT helium in a balloon
Answer:
Option C )The number of atoms of each element is the same on each side of the equation.
Answer:Well-known examples are sodium hydroxide (NaOH) with OH- as the polyatomic anion, calcium carbonate (CaCO3), and ammonium nitrate (NH4NO3), which contains two polyatomic ions: NH+ and NO3-. ... The properties of compounds containing polyatomic ions are very similar to those of binary ionic compounds.
Explanation: