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The atomic radius decreases as we move across a period because 

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Important Questions on Periodic Classification Of Elements

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10th CBSE
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Foundation Course Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE>Q 16
Which statement is wrong about C and Si? 
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Foundation Course Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE>Q 17
In the third period of the periodic table, the element having smallest size is 
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10th CBSE
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Foundation Course Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE>Q 18
Which of the following is the most non-metallic element?
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10th CBSE
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Foundation Course Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE>Q 19
The noble gases are unreactive because 
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10th CBSE
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Foundation Course Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE>Q 20
Which of the following elements is a metalloid? 
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10th CBSE
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Foundation Course Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE>Q 21
The atoms of elements belonging to the same group of periodic table have the same number of 
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Foundation Course Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE>Q 22

In the periodic table, the metallic character of elements 

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10th CBSE
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Foundation Course Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE>Q 23
Which of the following statements does not apply to elements belonging to the same period of the periodic table?