Question: Q. 4. Taking the Bohr radius as a0=53pm, the radius of Li++ion in its ground state, on the basis of Bohr’s model, will be about (a) 53pm. (b) 27pm. (c) 18pm. (d) 13pm.

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Solution:

Ans. Correct option : (c)

Explanation : According to Bohr’s model of an atom, radius of an atom in its ground state is

r=r0Z

where, r0 is Bohr’s radius and Z is atomic number. As given that,

r0=53pm and atomic number of Lithium atom is 3

so, r=533=17.67pm18pm



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