What are signs that a chemical reaction has accrued

How are ionic bonds formed and what is the attractive force within an ionic bond

Consider the following reaction at equilibrium: c(s)+h2o(g)⇌co(g)+h2(g) predict whether the reaction will shift left, shift right, or remain unchanged upon each of the following disturbances. a) c is added to the reaction mixture. b) h2ois condensed and removed from the reaction mixture c) co is added to the reaction mixture d) h2 is removed from the reaction mixture.

How many neutrons does an element have if its atomic number is 50 and its mass number is 166