Demócrito postuló que la materia era, y estaba formada por una partícula a la que llamó átomo, que significa me ayudan plis
helpme plis

Determine the  wavelength of light emitted when an electron  in an li2+ ion  makes a transition from an orbital with n  =  6 to an orbital with n  = 5.

The answer is d.potassium

Answer the molar mass of magnesium is 24.305g/mol.

B.1 - hydrogren-1 can only mean there is 1 neutron. it's obvious there is 1 proton or else it wouldn't be hydrogen, so they wouldn't put a number after it unless they were indicating the number of neutrons