The atomic radii of li + and o2− ions are 0.068 and 0.140 nm, respectively. (a) calculate the force of attraction between these two ions at their equilibrium interionic separation (i. e., when the ions just touch one another). (b) what is the force of repulsion at this same separation distance?

Explanation:

Given that,

Charge on Li,

Charge on Oxygen,

Atomic radii of lithium,

Atomic radii of oxygen,

Distance between charges,

(a) The force pf attraction is given by :

(b) Let F' is the force of repulsion. We know that when both charges are like, then there is force of repulsion.

F = -F'

Hence, this is the required solution.

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