what are the difference among metallic , covalent and van der waals radius ?

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Q. Explain what you understand by covalent radius, van der Waals radius,ionic radius and atomic radius. How do they vary in a period and in a group?

Which of the following statement is correct regarding covalent radius and van der Waals radius?

students Ram, Shyam and Raj measured the radius of an element A. The values of their practical were not same (Ram = 110 nm, Shyam = 190 nm and Raj = 108 nm). Their teacher explained that their measurement were correct by saying that the recorded values are -

Students Ram, Shyam, and Raj measured the radius of an element A. The values of their practical were not the same
(Ram = 110 nm, Shyam = 190 nm and Raj = 108 nm).

Their teacher explained that their measurement was correct by saying that the recorded values are

STATEMENT-1 : The atomic radius of inert gases is high.
STATEMENT-2 : Van der waals radius is less than covalent radius.

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