I do believe the answer is A. Hope this helps.
For the noble gasses, you get D, but metals are basically everywhere in the periodic table...
Answer:

Explanation:
Ionic bond is a bond between metals and non-metals with strong forces of attraction between charged ions.
Too many to know in the world.
Answer:
Elements combine to form chemical compounds that are often divided into two categories
When two or more atoms chemically bond with each other, the resultant chemical structure is a molecule.