Decrease in atomic number is observed during

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(D) In $Alpha$ emission,the atomic number decreases by $2$ units. In $Electron$ capture,a proton is converted into a neutron,decreasing the atomic num

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(D) In $Alpha$ emission,the atomic number decreases by $2$ units. In $Electron$ capture,a proton is converted into a neutron,decreasing the atomic number by $1$ unit. In $Positron$ emission,a proton is converted into a neutron,decreasing the atomic number by $1$ unit. Therefore,all these processes result in a decrease in atomic number.

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