BTEC Applied Science Physical and Chemical properties Exam Questions And Verified Answers 2024.

Atomic radius - Answer Size of the atom. Decreases in size with increasing protons or if atom loses electrons (cation) Increases in size with more shells or if atom gains electrons (anion). First Ionisation energy - Answer The energy needed to remove one mole of electrons from an atom in its gaseous atom First ionisation energy down groups - Answer Decreases More shells = more shielding = weaker attraction = easier (less energy) to lose one electron First ionisation energy across periods - Answer Increases More protons = stronger attraction = harder (more energy) to lose one electron Electron affinity - Answer Energy released when one mole of electrons is gained by an atom in its gaseous state Electron affinity across a period - Answer More protons = stronger attraction with an incoming electron = more energy released when electron is gained