Is fluorine malleable, ductile or brittle? is fluorine a conductor of heat and electricity? what does fluorine combine with or react with? what family does fluorine come from? alkali metals, alkaline earth, transition metals, non-metal, metalloid, noble gas?

Fluorine is an element which is an halogen. It is BRITTLE when solid. All halogens are brittle. It is a non-metal. Its symbol is F. It is pale yellow or colorless gas.

Since Fluorine is a non metal, IT IS A POOR CONDUCTOR OF HEAT AND ELECTRICITY. NO, IT IS NOT A CONDUCTOR OF HEAT AND ELECTRICITY. All halogens have this feature.

Fluorine can react with other halogens such as chlorine, bromine, iodine, etc to form respective compounds. It is very reactive and reacts with glass, water and other metals. It is so reactive that it is not found in its elemental form in the nature. Generally fluorine reacts with other elements to form FLUORIDES. For example, fluorine reacts with hydrogen to form hydrogen fluoride (HF). 

Fluorine comes from HALOGEN and NON-METAL family. It is chemically very reactive and forms compounds with other molecules. It is the first element of its family.

Spontaneity tell us the direction of the reaction, but not how fast it goes. gibbs free energy brings together enthalpy, entropy and temperature in one easy formula. g = h - ts. and, finally the sign of delta g is always negative for a spontaneous reaction.