Consider the following representation based on long form of periodic table. [SEE DIAGRAM] Value of a — Periodic Table and Periodicity Chemistry Question
Question
Consider the following representation based on long form of periodic table. [SEE DIAGRAM] Value of all four quantum number for last electron of element 'X' in their ground state is n = 4, l = 1, m = 1 and s = -1/2 and spin multiplicity of element 'X' in their ground state is 4.
![Chemistry diagram for: Consider the following representation based on long form of periodic table. [SEE DIAGRAM] Value of all four quantum numb](/_next/image?url=https%3A%2F%2Furywdhpqdpvmqzlenttu.supabase.co%2Fstorage%2Fv1%2Fobject%2Fpublic%2Fquestion-images%2Fvkj%2Fch01_l3_Q002.png&w=1920&q=75)
💡 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.