The increasing order of the atomic radii of the following elements is:

(a) C
(b) O
(c) F
(d) Cl
(e) Br

Question

The increasing order of the atomic radii of the following elements is:

(a) C
(b) O
(c) F
(d) Cl
(e) Br

Canvas Classes · Accepted Answer

Strategy:
 Atomic radii decrease across a period (increasing ) and increase down a group (increasing number of shells).

Step 1: Evaluate Period 2 elements
Trend: .
Thus: .

Step 2: Evaluate Group 17 elements
Trend: .
Thus: .

Step 3: Combine
Chlorine and Bromine are in lower periods (3 and 4) than C, O, F, making them much larger.
Order: .

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