why are chalcogens called so?
432031
The group VIA elements are called chalcogens because most ores of copper (Greek chalkos) are oxides or sulfides, and such ores contain traces of selenium and tellurium.
1431880
Noble Gases They were once called inert gases because they were thought to be completely inert—unable to form compounds. This is a reasonable belief because the noble gases have a complete octet, making them very stable and unlikely to gain or lose any electrons.
91389
The noble gases, in order of their density, are helium, neon, argon, krypton, xenon and radon. They are called noble gases because they are so majestic that, in general, they don't react with anything. For this reason they are also known as inert gases.
1380365
Also Known As: Elements belonging to this group are also known as pnictogens, at term derived from the Greek word pnigein, which means "to choke". This refers to the choking property of nitrogen gas (as opposed to air, which contains oxygen as well as nitrogen).
187683
The transition metals were given their name because they had a place between Group 2A (now Group 2) and Group 3A (now Group 13) in the main group elements. Therefore, in order to get from calcium to gallium in the Periodic Table, you had to transition your way through the first row of the d block (Sc → Zn).
1082474
Sulphur naturally exists in nature as S8 molecules. On heating these rings break and link jointly in to long chains. Hence sulphur has greater tendency for catenation than oxygen. Titanium metal is converted to its volatile compound and then it is decomposed to give its pure metal.
827514
Chalcopyrite Crystal Healing Properties: Chalcopyrite removes energy blockages, cleansing, activating and aligning the chakras and energy bodies at the same time. It is an excellent aid to increase self esteem, banish fears and doubts and soothe the emotions.
861646
no they are not because isobars are those whose atoms of different elements having different atomic numbers but the same mass number are known as isobars. Isotones are elements having the same number of neutrons. Thus valency of both Sulphur and Oxygen is 2.
513485
For example, iodine and tellurium should be the other way around, based on atomic weights, but Mendeleev saw that iodine was very similar to the rest of the halogens (fluorine, chlorine, bromine), and tellurium similar to the group 6 elements (oxygen, sulphur, selenium), so he swapped them over.
567575
All noble gases have full s and p outer electron shells (except helium, which has no p sublevel), and so do not form chemical compounds easily. Because of their high ionization energy and almost zero electron affinity, they were not expected to be reactive.
374131
Because we have a combination of a metal and non-metalm Na2S (Sodium sulfide) is considered an ionic compound.
213390
The nonmetals arsenic (As), tellurium (Te) and selenium (Se) are also named like the transition metals, and can form either cations or anions.
417445
The elements in group one of the periodic table (with the exception of hydrogen - see below) are known as the alkali metals because they form alkaline solutions when they react with water. ... The elements in this group, which are all shiny and silvery-white in appearance, are known as the alkaline earth metals.
862069
The electrons in this shell are the ones that form bonds with neighboring atoms. Such bonds are called covalent bonds. Most conductors have just one electron in the valence shell. Semiconductors, on the other hand, typically have four electrons in their valence shell.
19645
The name comes from the fact that the oxides of these metals produced basic solutions when dissolved in water, and they remained solids at the temperatures available to the ancient alchemists. Like the Group 1A elements, the alkaline earth metals are too reactive to be found in nature in their elemental form.
1017916
The nonmetals arsenic (As), tellurium (Te) and selenium (Se) are also named like the transition metals, and can form either cations or anions. Rule 2: anions.
49054
Some of the groups have widely-used common names, including the alkali metals (Group 1) and the alkaline earth metals (Group 2) on the far left, and the halogens (Group 17) and the noble gases (Group 18) on the far right. The elements can be broadly divided into metals, nonmetals, and semimetals.