Configuraciones electronica el grupo es igual al periodo

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.

How many liters of oxygen gas, at standard temperature and pressure, will react with 35.8 grams of iron metal? 4 fe (s) + 3 o₂ (g) → 2 fe₂o₃ (s)

How many grams of magnesium metal will react completely with 8.3 liters of 5.5m hcl? show all work