1.

Taking the Bohr radius as a_(0)= 53 pm the radius of Li^(++) ion in its ground state, on the basis of Bohr's model, will be about.

Answer»

53 pm
27 pm
18 pm
13 pm

Solution :Orbital radius of electron in `n^(th)` ORBIT of an electron in H-like atoms
`r_(n)=(a_(0)n^(2))/(Z)`
TAKING `Z=3` for `Li^(++)` ION and n=1 for its ground state,
`r_(1)=(53)XX((1)^(2))/(3)`
`:. r_(1)(53)xx((1)^(2))/(3)`
`:.r_(1)=17.67` pm
`~~18` pm (picometer)


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