Network solids are hard and have high melting points. which statement explains these properties?
a.
the atoms are held together with large networks of metallic bonds.
b.
the atoms are held together with large networks of electromagnetic forces.
c.
the atoms are held together with large networks of intermolecular forces.
d.
the atoms are held together with large networks of covalent bonds.

The correct answer is A the atoms are held together with large network of metallic bonds.

Explanation:

Metallic bond is a specific type of bond that is formed by interaction of many detached negatively charged electron with positively charged ions or cations,which provides a definite structure to the substance.

Due to the low ionization energy the electrons present in the outerorbital can be de localized throughout the metal.The de localized electrons able to freely move around the crystalline structure.

 There is a presence of strong interaction between negatively charged electrons and positively charged ions which is responsible for high melting and boiling point of metals.

qualitative observation deals with data that can be observed with our senses: sight, smell, touch, taste, and hearing. they do not involve measurements or numbers. for instance, colors, shapes, and textures of objects are all qualitative observations.