There are 7 electrons are present in the outermost shell of Atom X.
In the outermost shell there are 7 electrons because in the first the shell there is a space for 2 electrons, in the second shell there is a place for 8 electrons so there is 10 electrons are present in both shells. The remaining 7 electrons are present in last shell which needs only one electron to become stable and completion of the shell so we can conclude that there are 7 electrons are present in the outermost shell of this element.
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