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Experimentally it is found that 12.8 eV energy is required to separate a hydrogen atom into a proton and an electron. so the orbital radius of the electron in a hydrogen atom is `9/x xx 10^-10` m. The value of the x is: _____ (1eV=`1.6 xx 10^-19` J, `1/4 `pi``in`_0`=`9 xx 10^9 Nm^2/C^2` and electronic charge = `1.6 xx 10^-19` C)

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