The trite phrase "the 92 naturally-occurring chemical elements" is often seen, but is incorrect. There are only 88 naturally-occurring chemical elements. The elements 43, 61, 85 and 87 have no stable isotopes, and none of long half-life, so they are not naturally present.
92 Natural Elements and Atomic Numbers These are the widely accepted 92 elements that exists naturally on Earth. Another 6 are debated, and all the other elements were synthetically created.
Elements 1 through 92 (except for elements 43 and 61) occur naturally on Earth, although some are only present in extremely small quantities. Element 43, Technetium (Tc), is unstable, and all of its isotopes have relatively short half-lives, ranging from 4.2 million years ( 98 Tc) to 5.0 seconds ( 108 Tc).
If all four questionable elements are struck from the list of “naturally occurring” elements, there are either 90 or 88 naturally occurring elements, depending on whether or not neptunium and plutonium are included on the list. Some people include astatine and francium as well, raising the total to 92 or 90.
Of the 118 elements that have been discovered, there are 90 elements that occur in nature in appreciable amounts. Depending who you ask, there are another 4 or 8 elements that occur in nature as a result of radioactive decay of heavier elements. So, the grand total of natural elements is 94 or 98.
So, you may wonder how many elements can be found naturally. The usual textbook answer is 91. Scientists used to believe that, except for the element technetium , all the elements up to element 92 ( uranium ) could be found in nature.
What Elements Are Found in the Human Body? There are 92 elements that occur naturally on Earth. For living things, only 11 of these elements are found in larger than trace quantities. Any amount 0.01% or less is considered a trace element. For vertebrates, such as humans, there are two additional elements that occur in larger than trace amounts these are Iodine and Iron.
Although there are at least 106 known elements, 98% of the planet is made up of only six elements: iron, oxygen, magnesium, silicon, sulfur and nickel. The first 92 are naturally occurring elements; the remainder are man-made and radioactive.
-the elements carbon, hydrogen, nitrogen, and oxygen make up 20-25% of living mass. -All organisms require 25 of the 92 naturally occurring elements to survive. -Given their low concentrations in nature, the toxicity of some elements is generally not a factor in the evolution of biological communities.
The picture to the left shows the periodic table of the elements. Scientists made this table as a way to organize all the elements that have ever been found or created. ... Even though there are 92 elements that naturally occur, only eight of them are abundant in the rocks that make up the Earth’s outer layer, the crust.