Tuesday, October 12, 2021

Periodic Classification of Elements | Class 10 | Activity 5.7 with Solution

Periodic Classification of Elements | Activities in Text Book with Solution

Activity 5.7

Atomic radii of the elements of the second period are given below:

Period II elements:     B     Be     O     N     Li     C
Atomic radius (pm) : 88    111    66   74    152   77

Arrange them in decreasing order of their atomic radii.

✅ Answer:

Period II elements

Li

Be

B

C

N

O

Atomic radius (pm)

152

111

88

77

74

66

 
Are the elements now arranged in the pattern of a period in the Periodic Table?

✅ Answer: Yes. 

Which elements have the largest and the smallest atoms?

✅ Answer: Lithium (Li) has the largest atoms (152 pm). Oxygen (O) has the smallest atoms (66 pm).

How does the atomic radius change as you go from left to right in a period?

✅ Answer: The atomic radius decreases.

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