Explain how the elements can be ordered by the amount of energy that is emitted during the flame tests ?

Achange in the number of neutrons in an atom will change an blank . when the number of protons changes in an atom, a new element will form.

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?

The identities of substances are the same before and after which type of change