The likely thing which will occur when an atom of this element 1s²2s²2p6 3s¹ comes near an atom having seven valence electrons is what is referred to as electrovalent bonding.
This is also referred to as ionic bonding and involves the transfer of atoms from one element to another. This is done so as to ensure that an octet configuration is achieved.
The element 1s²2s²2p6 3s¹ is Sodium and will undergo ionic bonding with the chlorine. One valence electron is transferred from the sodium to the chlorine which makes them stable.
This is therefore the reason why electrovalent bonding will most likely between the two elements.
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