Isotopes are atoms with the same number of protons and electrons but different number of neutrons.
Extra for better understanding:
Thus, the relative atomic mass (Ar) differs amongst the isotope. For example, Chlorine have 2 main isotopes with Ar of 35 and 37. The chemical property of the isotopes is the same but the physical property such as boiling point may change.
Answer: The mole ratio of sodium to sodium chloride 2:2.
Explanation:
As the given reaction equation is as follows.
Here, 2 moles of sodium reacts with 1 mole of 
and leads to the formation of 2 moles of NaCl.
This means that 2 moles of sodium gives 2 moles of NaCl on reaction with chlorine.
Hence, the ratio of moles of sodium to sodium chloride is 2:2.
Thus, we can conclude that the mole ratio of sodium to sodium chloride 2:2.
Answer:
The solubility of gases decreases with pressure as that of solids and liquids is not affected.
Answer: For safety
Explanation: One of the biggest reason why the water we use are treated is so that it is safe for us to use.
Answer:
What is
the volume of the balloon when the temperature is 310K?
