They share four electrons, two from each oxygen atom
I know that sulfur/sulphur does. It is commonly known as the sulfur s8 structure.
The compound sodium carbonate is a strong electrolyte because it completely dissociates when placed in water into its component ions. The equation of the reaction can be expressed as:

The dissociation leads to the formation of sodium and carbonate ions with the latter held together by its internal covalent bond.
This is unlike weak electrolytes that do not dissociate completely in water or aqueous solutions. Only a small fraction of the solute exists as ions in the solution.
More on strong and weak electrolytes can be found here: brainly.com/question/3410548
The answers to this problem is C
<span>some elements would be Beryllium, Barium, Magnesium, and Strontium</span>