Is sulfur a metal or nonmetal? Metals: There are 118 chemical elements listed in the periodic table of elements. Over 75 percent of them are metals. To be categorized as a metal, a substance needs to be a good conductor of both heat and electricity. Many, though not all, metals are al...
Metals is defined as those elements are good conductor of heat and electricity is called metals. For example :- Silver, Aluminum , Copper etc. Metals have high melting or boiling point. Metals react with water. Non-metals is defined as those elements don't show the properties of metals...
The FR prefix refers to the flammability rating of the resin system used in the laminate composites which make up PCB substrates. Adding bromine compounds to the resin produces flame retardant properties which self-extinguish burning. PCB materialflammability standards include: ...
And development of replacements for other bromine con- taining flame retardants and poly vinyl chloride, as well as PoHS(Norwegian hazardous substances regulation) containing materials will be completed in 2008. In addition, W3 which is currently in commercial production, had its PDP glass thicknes...
which is said to nearly reach a diamond’s hardness. This is probably due to the six boron atoms that create a very compact bond among them, having just one oxygen atom inserted in small notches. It is also a very good heat conductor and has excellent chemical stability, making it an id...
A particular solid is soft, a poor conductor of heat and electricity, and has a low melting point. Generally, such a solid is classified as: a) ionic b) metallic c) molecular d) covalent network What type of crystalline solid is SiO2(s, qua...
what is SO4 and why does it have a charge of -2? A small amount of liquid bromine is added to a container which is then sealed. Using the ideas of kinetic energy, can you explain why after one hour the bromine molecules have spread uniformly to occu ...
What must we know a given ionic salt to be able to predict whether it is a good or poor conductor, without testing its conductivity? List some properties that could be used to construct diagnostic tests to identify the type of solute that is in the followi...