Looking at the first symbol there are said to be 5 electron in the valence shell of an atom X. So the element is said to belongs to group number 15.
The electron configuration of an element is known to be a term that connotes how electrons are said to be shared in its atomic orbitals.
The Electron configurations of atoms is known to be one that has a form of a standard notation where all electron that has atomic subshells are said to be placed in a form of sequence.
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