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# The Atomic Radii of Three Elements X, Y and Z of a Period of the Periodic Table Are 186 Pm; 104 Pm and 143 Pm Respectively. Giving a Reason, Arrange These Elements in the Increasing Order of Atomic Numbers in the Period. Answer 25: - CBSE Class 10 - Science

ConceptPosition of Elements and Trends in the Modern Periodic Table

#### Question

The atomic radii of three elements X, Y and Z of a period of the periodic table are 186 pm; 104 pm and 143 pm respectively. Giving a reason, arrange these elements in the increasing order of atomic numbers in the period.

#### Solution

The elements in the increasing order of atomic numbers in the period is X<Z<Y. On moving from left to right in a period, the atomic number increases. Hence, the size of the atomic radius decreases.

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#### APPEARS IN

Lakhmir Singh Solution for Chemistry for Class 10 (2019 Exam) (2018 to Current)
Chapter 5: Periodic Classification Of Elements
Q: 25.3 | Page no. 304

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Solution The Atomic Radii of Three Elements X, Y and Z of a Period of the Periodic Table Are 186 Pm; 104 Pm and 143 Pm Respectively. Giving a Reason, Arrange These Elements in the Increasing Order of Atomic Numbers in the Period. Answer 25: Concept: Position of Elements and Trends in the Modern Periodic Table.
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