Arrange potassium, rubidium, calcium and barium in order of increasing atomic size.
Correct answer: B. Ca < K < Rb < Ba
- A. K < Ca < Rb < Ba
- B. Ca < K < Rb < Ba
- C. Ca < K < Ba < Rb
- D. K < Ca < Ba < Rb
Explanation
The correct order of increasing atomic size among potassium (K), calcium (Ca), rubidium (Rb), and barium (Ba) is:b. Ca < K < Rb < BaAtomic size generally increases down a group (from top to bottom) in the periodic table and decreases across a period (from left to right).In this case, potassium (K) and rubidium (Rb) are in the same group (Group 1, alkali metals), and barium (Ba) and calcium (Ca) are in the same group (Group 2, alkaline earth metals).Within a group, atomic size increases as you go down the column because each successive element has an additional energy level.Therefore, in this case, Ca < K < Rb < Ba is the correct order based on the trend of increasing atomic size down Group 1 and Group 2. Option b represents this correct order.
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