Questions: Across a period, which group will have the largest atomic radius? - halogens - alkali metals - alkaline earth metals - chalcogens

Transcript text: Across a period, which group will have the largest atomic radius? halogens alkali metals alkaline earth metals chalcogens

Solution

Solution Steps

Step 1: Understanding Atomic Radius Trends Across a Period

The atomic radius generally decreases across a period from left to right. This is because, as you move across a period, the number of protons in the nucleus increases, which increases the positive charge. This stronger positive charge pulls the electrons closer to the nucleus, resulting in a smaller atomic radius.

Step 2: Identifying the Groups in the Periodic Table

Halogens: Group 17
Alkali metals: Group 1
Alkaline earth metals: Group 2
Chalcogens: Group 16

Step 3: Determining the Largest Atomic Radius

Since the atomic radius decreases across a period, the group that appears first in the period will have the largest atomic radius. Among the given groups, the alkali metals (Group 1) appear first in the period.

Final Answer

\(\boxed{\text{alkali metals}}\)

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