Practice question
Question
Which element in group 15 forms a pentoxide with the highest thermal stability?
Explanation
Thermal stability of group 15 pentoxides (X₂O₅) decreases down the group due to weaker X-O bonds. N₂O₅ is the most stable thermally, decomposing at a higher temperature than P₂O₅, As₂O₅, or Sb₂O₅.