Which fourth-period element, X, forms the compound Lewis structure of the molecule X O 3. The X atom is central with three oxygen atoms connected by double bonds. Each oxygen atom has two lone pairs of electrons. As Br Kr Ga Ge Se

The fourth period element that is able to form a compound whose lewis structure is XO3 with X as the central atom and three oxygen atoms must be an element in group thirteen in the periodic table.

Gallium is known to form a trioxo- compound in which all gallium atoms are connected to oxygen atoms via double bonds. We don't have this type of compound formed by any other atom listed among the options hence the answer given above. The compound is written as GaO3.

annyksl annyksl · Answer 2 · 2021-12-01T20:53:42+01:00

The central atom is a gallium atom, which has the symbol Ga.

We can arrive at this answer because:

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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