El radio de un átomo de hidrógeno es aproximadamente de 0.37 Å y el radio medio de la órbita terrestre alrededor del Sol es del orden de 1.5 x 108 km. Calcule la relación entre el radio promedio de la órbita terrestre y el radio del átomo de hidrógeno

The activity series is shown in the attached picture. if the element is below the other, then you can displace the other. following the activity series as a guide, the reactions are as follows: nickel and aluminum chloride3 ni + 2 alcl₃  → 3 nicl₂ + 2 albarium and copper bromideba + cubr  →  no reaction because cu is less oxidizable than bapotassium nitrate and aluminum3 kno₃ + al  → al(no₃)₃ + 3 ksodium phosphate and zincnaso₄ + zn  → znso₄ + na

Idont know. if you want an answer you need to give us some context dude.

You can look it up online and some images should pop up