Substance A is shiny, conducts electricity well, and melts at 975 °C. Substance A is likely a(n): (a) ionic solid (b) metallic solid (c) molecular solid (d) covalent network solid

Metallic solid :-

(a) Electrical Conductivity :- Good conductors of heat and electricity

(b) Melting Point :- Melting point depends strongly on electronic configuration.

(c) Appearance :- Malleable, ductile and lustrous.

(d) Water solubility :- Insoluble

Covalent solid :-

(a) Electrical Conductivity :- Poor conductors of heat and electricity

(b) Melting Point :- High

(c) Appearance :- Hard, ductile and lustrous.

(d) Water solubility :- Insoluble

Molecular solid :-

(a) Electrical Conductivity :- Poor conductors of heat and electricity

(b) Melting Point :- Low

(c) Appearance :- Soft and dull surface.

(d) Water solubility :- Insoluble

Ionic solid :-

(a) Electrical Conductivity :- Poor conductors of heat and electricity

(b) Melting Point :- relatively high Melting point.

(c) Appearance :- Hard, brittle and dull

(d) Water solubility :- Soluble

Hence we can say that substance A is metallic solid.