¿Cuáles son los tres pasos necesarios para calcular la masa atómica promedio?

it should be all of them because it asks if you included all of those in your answer

explanation:

periodic trends is an atom that gets larger as the number of electronic shells increase, the radius of atoms increases as you go down a certain group in the periodic table of elements. in general, the size of an atom will decrease as you move from left to right of a certain period.

може ли да зареждате повече информация, моля