JEE Main 202628 JanuaryMorning Shift
- Exam
- JEE Main
- Year
- 2026
- Date
- 28 January
- Shift
- Morning Shift
- Subject
- Chemistry
- Chapter
- Classification of Elements and Periodicity in Properties
JEE Main 2026 · 28 January · Morning Shift · Chemistry · Classification of Elements and Periodicity in Properties
In period 4 of the periodic table, the elements with highest and...
In period 4 of the periodic table, the elements with highest and lowest atomic radii are respectively.
Options
- ARb & Br
- BK & Se
- C
- D
Correct answer
C.
Step-by-step solution
In period 4, atomic radii decrease from left to right as nuclear charge increases while electron shell remains constant. K (potassium) is at the extreme left of period 4 metals and has the highest atomic radius. Br (bromine) is near the right end as a nonmetal and has the lowest atomic radius in this period. Therefore, the elements with highest and lowest atomic radii in period 4 are K and Br respectively.