Please help! Thanks in advance.

When will le chatelier's principle come into effect? at the beginning of a reaction, when there are only reactants when a reaction has reached chemical equilibrium when a catalyst is added to a reaction mixture when a reaction is occurring but not yet at equilibrium

Which of the following elements would you expect to have the lowest ionization energy value? fluorine, lithium, neon, nitrogen

How would the number of moles (n) of o2 change if the atmospheric pressure doubled but all other variables stayed the same