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The element with the smallest size in group 13 is 

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Important Questions on Periodic Classification Of Elements

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10th CBSE
IMPORTANT
Foundation Course Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE>Q 10

From the given set of metals and non-metals identify the non-metals:

S,Mg,Al,P,N,Na,K

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10th CBSE
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Foundation Course Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE>Q 11
Which one of the following is the most electropositive element? 
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10th CBSE
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Foundation Course Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE>Q 12

Which of the following combination of elements belong to the same group? 

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10th CBSE
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Foundation Course Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE>Q 13
Which of the following elements has three valence electrons? 
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10th CBSE
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Foundation Course Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE>Q 14
Which of the following elements has highest electron gain enthalpy?
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10th CBSE
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Foundation Course Chemistry>Chapter 5 - Periodic Classification Of Elements>EXERCISE>Q 15

The atomic radius decreases as we move across a period because 

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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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10th CBSE
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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