Answer :
The central atom is a gallium atom, which has the symbol Ga.
What is Lone pair?
An electron pair in an atom's outermost shell that isn't shared with or bonded to another atom is known as a lone pair. Another name for it is a non-bonding pair. Making a Lewis structure is one approach to spot a lone pair. The amount of valence electrons in an atom is equal to the sum of the number of lone pair electrons and the number of bonding electrons. The lone pair idea is crucial to the valence shell electron pair repulsion (VSEPR) theory because it clarifies the molecule's shape.
According to the octet rule, an atom must have 8 electrons in the valence layer to achieve electrical stability.
These atoms can achieve this stability through covalent or ionic bonds.
According to the above question, we can state that an X atom received 6 electrons, as three oxygen atoms shared 2 atoms each with the X atom.
In this case, the atom x must have 2 atoms in the valence layer, to reach 8 atoms with the bonds it made with the oxygens.
Among the response options, Ga is the only one that has 2 electrons in the valence layer, being able to form bonds with oxygen.
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