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Fluorine, the most electronegative element in Pauling's scale have the value ______.

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Important Questions on Periodic Classification of Elements

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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Chemistry>Chapter 6 - Periodic Classification of Elements>Practice Exercise>Q 28
In the context of lanthanoids, which of the following statements is not correct?
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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Chemistry>Chapter 6 - Periodic Classification of Elements>Practice Exercise>Q 29
Identify the incorrect statement among the following.
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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Chemistry>Chapter 6 - Periodic Classification of Elements>Practice Exercise>Q 30
Al and Ga have the same covalent radius because of
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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Chemistry>Chapter 6 - Periodic Classification of Elements>Practice Exercise>Q 31
The first ionisation potential of Na, Mg, Al, Si are in the order.
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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Chemistry>Chapter 6 - Periodic Classification of Elements>Practice Exercise>Q 32
Anomalous behaviour of nitrogen is due to
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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Chemistry>Chapter 6 - Periodic Classification of Elements>Practice Exercise>Q 33
Ionic radii of zirconium and hafnium become almost identical because
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Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Chemistry>Chapter 6 - Periodic Classification of Elements>Practice Exercise>Q 34
Which of the following statements concerning ionisation energy is not correct?
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IMPORTANT
Pathfinder NDA / NA National Defence Academy and Naval Academy Entrance Examination Chemistry>Chapter 6 - Periodic Classification of Elements>Practice Exercise>Q 35
All the elements in a group (family) have a common valency. For example, all the elements of the carbon family (carbon, silicon, germanium, tin and lead) have the common valency four. However, some of these elements can also have a valency two. Which of the following have a valency two?