is it worn as a jewelry?
Yes, beads.
Glass art
The first uses of glass were in beads and other small pieces of jewelry and decoration. 
what is the basis of arranging the elements in the modern periodic table Atomic number, electron configuration, and recurring chemical properties. what is the purpose of the table? UNANSWERABLE why is called so? Because of the tabular display of the chemical elements. what sorts of elements can we see in it? Nonmetallic elements such as metalloids,  groups of families of elements and elements having metallic lustre. can you name a few of the first form? Boron, silicon, germanium, arsenic, antimony, and tellurium. where are they commonly applied? Alloying components, biological agents, catalysts and flame retardants. what do they do being the second type? They have medical applications, can be used in insecticides and herbicides, also they have antiseptic, antifungal, and antiviral properties. how are they used in making glass? As a glass fibre additive. which metalloid is used in formation of glass? Phosphorus, selenium, and lead. how does it contribute to art? Glass can be coloured by adding metal salts or painted and printed with vitreous enamels, leading to its use in stained glass windows and other glass art objects.
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Glass art [SEP] Jewelry
The first uses of glass were in beads and other small pieces of jewelry and decoration. Beads and jewelry are still among the most common uses of glass in art and can be worked without a furnace. It later became fashionable to wear functional jewelry with glass elements, such as pocket watches and monocles.