(b) Complete the following sentences ( i) Covalent radius is defined as …………………… ii) van der Waals radius is defined as ……………………… iii) Second ionisation of energy of an element is always higher than the first because……… iv) Difference between electron affinity and electronegativity is …………… v) The second electron affinity values are always positive because ………….

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Answers

2016-03-13T00:41:59+05:30
Iii) the energy required to remove an electron frm unipositive ion is called secnd ionizatn enrgy
it is difficult to remove an electron frm unipositive ion whn compared with neutral atom due to increase in nuclear attraction 
iv) electn affinity is the property of an isolated gaseous atom .
it release energy nd is measured in kj/mole
attraction of an atom fr a single electron..
electonegativity: property of an bonded atom.
relative quantity nd hs no units 
attraction of an atom for a pair of electrons.
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