are they categorized?
Yes, it is divided into nine categories; six for the metals, and two for nonmetals, and a metalloid category.
Periodic table
The elements of the periodic table shown here are divided into nine categories; six for the metals, and two for nonmetals, and a metalloid category. 
what do the alternating bands of jupiter suggest the presence of The zones' lighter color is believed to result from ammonia ice; what gives the belts their darker colors is uncertain. what is it composed of? It is mostly made of molecular hydrogen and helium in roughly solar proportions. what can you tell me about its structure? The atmosphere is classified into four layers: the troposphere, stratosphere, thermosphere and exosphere; the planet does not have a solid surface, and the lowest atmospheric layer, the troposphere, smoothly transitions into the planet's fluid interior. what is the symbol of the second chemical component mentioned above? 'He' when was it initially discovered? 1868 where is it placed in the periodic table? It is  the first in the noble gas group in the periodic table. what is it used for? It is used as a breathing gas - helium mixtures such as trimix, heliox and heliair are used for deep diving to reduce the effects of narcosis, which worsen with increasing depth. where is it abundantly found? It is the second most abundant element in the known Universe, constituting 23% of its baryonic mass. does it cause any hazards? Inhaling helium can be dangerous if done to excess, since helium is a simple asphyxiant and so displaces oxygen needed for normal respiration. how is it extracted? For large-scale use, it is extracted by fractional distillation from natural gas, which can contain as much as 7% helium. who introduced the table mentioned above? Russian chemist Dmitri Mendeleev what does the table contain? It is a tabular display of the chemical elements, which are arranged by atomic number, electron configuration, and recurring chemical properties. how many elements are there in it? 118
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Periodic table [SEP] Categories
The elements of the periodic table shown here are divided into nine categories; six for the metals, and two for nonmetals, and a metalloid category. The nine categories (or sets) correspond to those found in the literature for the applicable part of the periodic table. Different authors may use different categorisation schema depending on the properties of interest. An individual category is not necessarily exclusive according to its name, boundary, or shared properties. For example, while beryllium in Group 2 is colored as an alkaline earth metal, it is amphoteric rather than alkaline in nature. The heavier members of group 3 are shown as a lanthanide and an actinide, yet both are also transition metals.