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The atomic numbers of three elements, X, Y and Z are 9, 11 and 17 respectively. Which two of these elements will show similar chemical properties? Why?

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Question

The atomic numbers of three elements, X, Y and Z are 9, 11 and 17 respectively. Which two of these elements will show similar chemical properties? Why?

Short Answer
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Solution

The elements X and Z will show similar chemical properties.

X (Z = 9): Fluorine (F) → 7 valence electrons

Z (Z = 17): Chlorine (Cl) → 7 valence electrons

Both belong to Group 17 (halogens) and have the same number of valence electrons. Therefore, they have similar chemical properties.

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Chapter 1: Periodic Properties and Variations of Properties - Intext Question [Page 13]

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Lakhmir Singh Chemistry [English] Class 10 ICSE
Chapter 1 Periodic Properties and Variations of Properties
Intext Question | Q 10. | Page 13
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