Question:
Identify the group of periodic table that contains element Astatine.
Identify the group of periodic table that contains element Astatine.
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Astatine is the heaviest halogen.
Updated On: Oct 1, 2026
- \(17\)
- \(16\)
- \(18\)
- \(1\)
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept
Elements are placed in groups by their outer electron configuration. The halogens (F, Cl, Br, I, At) all have the outer configuration \(ns^2 np^5\).
Step 2: Detailed Explanation
Astatine (atomic number 85) has the configuration ending in \(6s^2 6p^5\). Seven valence electrons place it in group 17, below iodine.
Group 16 holds the chalcogens (O, S, Se, Te, Po), group 18 holds the noble gases, and group 1 holds the alkali metals. Astatine does not belong to any of these.
Final Answer:
Astatine is a halogen in group 17, option (A). \[ \boxed{17} \]
Elements are placed in groups by their outer electron configuration. The halogens (F, Cl, Br, I, At) all have the outer configuration \(ns^2 np^5\).
Step 2: Detailed Explanation
Astatine (atomic number 85) has the configuration ending in \(6s^2 6p^5\). Seven valence electrons place it in group 17, below iodine.
Group 16 holds the chalcogens (O, S, Se, Te, Po), group 18 holds the noble gases, and group 1 holds the alkali metals. Astatine does not belong to any of these.
Final Answer:
Astatine is a halogen in group 17, option (A). \[ \boxed{17} \]
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