KCET2026ChemistryClassification of Elements and Periodicity in Properties
Match List-I with List-II: List-I (Element-Atomic number) List-II (Position in periodic table) (a) Ra – 88 (i) 4^ th period, 13^ th group (b) Ga – 31 (ii) 6^ th period, 6^ th group (c) W – 74 (iii) 5^ th period, 10^ th group (d) Pd – 46 (iv) 7^ th period, 2^ nd group Choose the correct answer from the options given below.
Options
- Aa-iv, b-i, c-ii, d–iii
- Ba-i, b-ii, c-iii, d-iv
- Ca-iv, b-ii, c-iii, d–i
- Da-iii, b-iv, c-i, d-ii
Correct answer
A. a-iv, b-i, c-ii, d–iii
Step-by-step solution
The position of an element in the periodic table can be determined using its atomic number and the nearest preceding noble gas. (a) Ra ( Z = 88 ): The preceding noble gas is Radon (Rn, Z = 86 ), which belongs to the 6^ th period and 18^ th group. The next two electrons enter the 7s orbital. Thus, Ra belongs to the 7^ th period and 2^ nd group. (a) (iv) (b) Ga ( Z = 31 ): The preceding noble gas is Argon (Ar, Z = 18 ), which belongs to the 3^ rd period. The next electrons fill the 4s , 3d , and 4p orbitals. The grou