Which of the following determines the range of spectral lines produced during electron transition?

This is a characteristic of the elements in the periodic table that shows a pattern. it may increase or decrease across or down the table.

Explain the relationship between forward and backward reactions in equilibrium, and predict how changing the amount of a reactant (creating a tension) will affect that relationship.

If a molecule with a molecular formula of c13h18 is treated with an excess of h2 in the presence of finally divided pt metal under conditions required for maximum hydrogenation of the molecule to give a molecule with a formula c13h24, how many rings are in the molecule?