From the following, the quantity (constructed from the basic constants of nature), that has the dimensions, as well as correct order of magnitude, vis-a-vis typical atomic size, is :

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a 0 ​ = πm e 2 ε 0 ​ h 2 ​ Option 4 is 4 π 2 a 0 ​ , a length on the atomic/nanometre scale Option 2 is the much smaller classical electron radius; 1 and 3 are inverse lengths Thus 4 is intended

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