Well they are not. Silicon is used in solar panels - an optoelectronic device.
What is true that the nature of the semiconductors made by reacting group 13 and group 15 (old school group III and group V) generically called the III/V semiconductors.
Examples are Gallium nitride, gallium phosphide, gallium arsenide, indium phosphide.
The key is the nature of the band gap and how this can be affected by doping. Gallium nitride is used in many applications, and is used with suitable doping in blu-ray disc reader laser diodes
There is a total of 17 elements in those groups.
Group 18 (Noble Gases) contains the largest main group elements because they have the highest atomic numbers and largest atomic radii among the main group elements.
Group 1 Elements (elements in the first group [column]) are classed as Alkali Metals. Group 2 Elements (elements in the second group [column]) are classed as Alkaline Earth Metals. All elements not in a representative group are classed as Transition Metals. Group 3 Elements (elements in the third full group [coulumn]) are classed as Earth Metals
Salt formers / group 17 elements. The elements of Group VII (or group 17) of the Periodic Table are called halogens, which means "salt formers"
Elements in the same group as oxygen are sulfur, selenium, tellurium, and polonium. Group 16 elements are also known as the chalcogens and share similar chemical properties.
To effectively memorize the elements of the periodic table, create mnemonic devices, use flashcards, practice regularly, and group elements with similar properties together.
elements are in the same group since they react similarly to other elements in that group.
main group elements
There is a total of 17 elements in those groups.
No. noble gases are group VIIIA or group 18 elements
Group 17 elements are called the halogens. Group 18 elements are called the noble gases.
Group 17 elements are called the halogens. Group 18 elements are called the noble gases.
The oxidation numbers for the first 20 elements in the periodic table are typically as follows: Group 1 elements: +1; Group 2 elements: +2; Group 13 elements: +3; Group 14 elements: +4 or -4; Group 15 elements: -3; Group 16 elements: -2; Group 17 elements: -1; Group 18 elements: 0. Keep in mind that oxidation numbers can vary in different compounds and contexts.
group 2 elements are alkaline elements.one of the element in d group is berrylium
Group one elements are the alkali metals.
Group 14 elements, mainly silicon or germanium are semiconductors. If they are dopped with group 13 elements such as gallium / indium or with group 15 elements such as arsenic / antimony, then the conducting ability increases.
Group IA or group 1 elements are known as alkali metals.