porque se puede considerar que el derecho sea uno de los principales entre los derechos de 2da generacion ( la pregunta es de construccion de ciudadania y es para mañana)

Is there any opitions? if you have the periodic table, the noble gases are 8a family, the halogen are the 7a family, and the nonmetal are  carbon, nitrogen, phosphorus, oxygen, sulfur, selenium, fluorine, chlorine, bromine, iodine and astatine.

How are period and frequency related to each other? dperiod is the reciprocal of frequency.