The successive ionization enthalpies () of an isolated atom always strictly increase. Which of the f — Periodic Table and Periodicity Chemistry Question

💡 Solution & Explanation

A massive spike in IE occurs when an electron is removed from a stable, fully filled inner noble gas core. If the jump occurs after the 1st electron ($IE_2 >> IE_1$), the atom had 1 valence electron (Group 1). If after the 2nd ($IE_3 >> IE_2$), it had 2 (Group 2). If after the 3rd ($IE_4 >> IE_3$), it had 3 (Group 13). Halogens have 7 valence electrons, so their jump would be after $IE_7$.