The energy required to pull the most loosely bound electron form an atom is known as ionization pote — Periodic Table and Periodicity Chemistry Question
Question
The energy required to pull the most loosely bound electron form an atom is known as ionization potential. It is expressed in electron volts. The value of ionization potential depends on three factors: (i) the charge on the nucleus (ii) the atomic radius and (iii) the screening effect of inner electron shells.
💡 Solution & Explanation
Step 1: Relate the atomic numbers to the nearest noble gases in the periodic table. Radon (Rn) has Z=86, and the 7th period ends with the noble gas Oganesson (Og) at Z=118 in Group 18. Step 2: The element with atomic number Z=117 lies immediately before Oganesson (Z=118) in the 7th period, which places it in Group 17 (the halogens). Step 3: The element with atomic number Z=120 will belong to the 8th period. The alkali metal of Group 1 will be Z=119, and the alkaline earth metal of Group 2 will be Z=120. Thus, they belong to groups 17 and 2.