![]() ![]() Therefore, they occur as metal selenides and tellurides in the naturally occurring sulphide ores. Selenium and tellurium are more electronegative than metals. The other elements are comparatively rare. It occurs in the combined form of sulphides ores and sulphate ores. It constitutes 0.03 - 0.1% by the mass of the earth’s crust. ![]() Sulphur- Sulphur is the non-metallic element and it is the sixteenth most abundant element found on the earth crust. Oxygen occurs as ozone, an allotrope of oxygen in the upper atmosphere and is of great importance. As water, it comprises 89% by weight of the oceans. It also occurs as metal oxide ores and deposits of oxo salts such as carbonates, sulphates, nitrates, and borates. Oxygen makes up the major component of the earth crust. Most of it has been produced by photosynthesis. It occurs in the free form as an oxygen molecule and makes up 20.946% of the volume of the atmosphere. Oxygen is the most abundant of all elements. Oxygen has, with the exception of fluorine, the most elevated electronegativity and electron partiality of any component the upsides of these properties then, at that point, decline strongly for the excess individuals from the gathering to the degree that tellurium and polonium are viewed as prevalently metallic in nature, having a tendency to lose instead of acquiring electrons in compound development. This propensity to frame adversely charged particles, ordinary of nonmetallic components, is quantitatively communicated in the properties of electronegativity (the supposition of halfway bad charge when present in the covalent blend) and electron proclivity (the capacity of a nonpartisan molecule to take up an electron, shaping a negative particle).īoth these properties decline in force as the components expand in nuclear number and mass procedure down section 16 of the intermittent table. An atom having such an electronic design will in general, frame a steady shell of eight electrons by adding two more charges. The components having a place in Group 16 of the occasional table are portrayed by electron setups in which six electrons possess the peripheral shell. This is because many naturally occurring metal ores occur as oxides and sulphides. The first four elements (oxygen, sulphur, selenium, and tellurium) of the 16 th group are known as chalcogens. These are named as oxygen group elements after the name of the first member of the group. The elements oxygen, sulphur, selenium, tellurium and polonium constitute group 16 elements of the periodic table. ![]()
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