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The bond length of HCl bond is 136 pm. Covalent radius of hydrogen atom is 37 pm. What is the covalent radius of chlorine atom?


Covalent radius of chlorine atom
=  136 pm - 37 pm = 99 pm.

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Which radius, vander Waal's or covalent, is larger for an atom?


Vander Waal’s radius is larger by 40%. 
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What are the advantages of periodic classification of elements?


(i) The classification simplifies the learning of chemistry.

(ii) Periodic table explains clearly why elements in a group display similar properties. The periodic table serves as a guide for scientific investigations.

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How is the atomic radius of an element actually expressed?


Atomic radius of an element is generally expressed as covalent radius because most of the elements form covalent bonds in their atoms.
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An element A with atomic number 112 has recently been discovered. Predict its electronic configuration and suggest the group in which this element be placed.


[Rn] 5f14 6d10 1s2. Thus,the given element is placed in group 14.
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