It has to be oxygen as it has a charge of -2 and magnesium has a charge of +2 so when they bond it would be MgO
The configuration is:
1s2 2s2 2p6 3s1
The compound Na2S or Sodium sulfide is soluble in
water. This compound is a water-soluble salt that give strong alkaline
solutions. When exposed to air or humidity this compound gives-off hydrogen sulfide
that smells almost the same as rotten eggs.
This chemical is commonly used in the pulp and
paper industry. Sodium sulfide compounds are usually used in chemical
photography, textile bleaching, making dyes, and even detergents.
<span>The other 3 compounds are non-soluble in water. Their
compositions are mostly metal in nature and require other process to transform
them into different compound forms. </span>
Answer:
D. Number of electrons