Consider the following statements
S1: Determination of radii of the atom is difficult because the size of the atom is too small
S2: Determination of radii of the atom is difficult because the electron cloud surrounding the atom does not have a sharp boundary
S1 and S2 both are true
S1 is true and S2 is false
S1 is false and S2 is true
S1 and S2 both are false
Both the given statements are true and thus an average estimate of atomic size is made by knowing the distance between the atoms in the combined state.
Therefore, Option(1) is correct.
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