Tuesday, October 12, 2021

Periodic Classification of Elements | Class 10 | Activity 5.8 with Solution

Periodic Classification of Elements | Activities in Text Book with Solution

Activity 5.8

Study the variation in the atomic radii of first group elements given below and arrange them in an increasing order.

Group 1 Elements:     Na     Li     Rb     Cs     K
Atomic Radius (pm): 186   152   244   262   231

✅ Answer: 

Elements

Atomic radius (pm)

Li

152

Na

186

K

231

Rb

244

Cs

262


Name the elements which have the smallest and the largest atoms.

✅ Answer: Li has smallest atom and Cs has largest atom.

How does the atomic size vary as you go down a group?

✅ Answer: Atomic size increases down the group due to the addition of new shells.

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