Answer:
Explanation
Hardness has been defined the level of difficulty with a smooth surface of a mineral may be scratched. The hardness of a mineral species is upon the strength of the bonds which compose its crystal structure Hardness is measured of how easily a material can be scratched or indented Hard materials are often very brittle.
The one that contains ionic bonding would be B
positively charged and located inside the nucleus
Ionically Bond the Halogen with a group 1 element to make it stable
