All the elements, on the basis of long form of periodic table, can be divided into four blocks, s, p, d and f. The ionization energies, electron affinities, electronegativities, atomic and ionic radii

Question

All the elements, on the basis of long form of periodic table, can be divided 
into four blocks, s, p, d and f. The ionization energies, electron affinities, 
electronegativities, atomic and ionic radii and other physical properties 
usually shown a regular pattern of change within a group or along period with 
some irregularities.

Prashant Kotian · Accepted Answer

Correct answer: D. 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.

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