It occurs on Earth only as the result of the radioactive decay of certain heavier elements.

The system of Chinese astrology was elaborated during the Zhou dynasty ( 1046 – 256 BC ) and flourished during the Han Dynasty ( 2nd century BC to 2nd century AD ), during which all the familiar elements of traditional Chinese culture – the Yin-Yang philosophy, theory of the 5 elements, Heaven and Earth, Confucian morality – were brought together to formalise the philosophical principles of Chinese medicine and divination, astrology and alchemy.

In addition, a rotation axis at an angle to the magnetic axis may be spinning different bands of magnetically-sorted elements into the line of sight between Alioth and the Earth.

Most rare elements on Earth are not needed by life ( exceptions being selenium and iodine ), while a few common ones ( aluminum and titanium ) are not used.

Of the 118 known elements, only the first 98 are known to occur naturally on Earth ; 80 of them are stable, while the others are radioactive, decaying into lighter elements over various timescales from fractions of a second to billions of years.

Those elements that do not occur naturally on Earth have been produced artificially as the synthetic products of man-made nuclear reactions.

The high abundance of oxygen, silicon, and iron on Earth reflect their common production in such stars, after the lighter gaseous elements and their compounds have been subtracted.

All but a few of the most inert elements, such as noble gases and noble metals, are usually found on Earth in chemically combined form, as chemical compounds.

While about 32 of the chemical elements occur on Earth in native uncombined form, most of these occur as mixtures.

Two thirds of the chemical elements occur on Earth only as compounds, and in the remaining third, often the compound forms of the element are most common.

Most rare elements on Earth are not needed by life ( exceptions being selenium and iodine ), while a few quite common ones ( aluminium and titanium ) are not used.

Of these 118 elements, 98 occur naturally on Earth.

The first 98 elements have been detected directly on Earth as primordial nuclides present from the formation of the solar system, or as naturally-occurring fission or transmutation products of uranium and thorium.

The remaining 24 heavier elements, not found today either on Earth or in astronomical spectra, have been derived artificially.

All of the heavy elements that are derived solely through artificial means are radioactive, with very short half-lives ; if any atoms of these elements were present at the formation of Earth, they are extremely likely to have already decayed, and if present in novae, have been in quantities too small to have been noted.

Chemical elements may also be categorized by their origin on Earth, with the first 98 considered to be naturally occurring, while those with atomic numbers beyond 98 have only been produced artificially as the synthetic products of man-made nuclear reactions.

On Earth ( and elsewhere ), trace amounts of various elements continue to be produced from other elements as products of natural transmutation processes.

The abundance of the chemical elements on Earth varies from air to crust to ocean, and in various types of life.

Aluminum is also far more common in the Earth and Earth's crust than the universe and solar system, but the composition of Earth's mantle ( which has more magnesium and iron in place of aluminum ) more closely mirrors that of the universe, save for the noted loss of volatile elements.

It is the heaviest element to occur naturally on Earth ; heavier elements can only be produced by synthesis.

In classical thought, the four elements Earth, Water, Air, and Fire frequently occur ; sometimes including a fifth element or quintessence ( after " quint " meaning " fifth ") called Aether in ancient Greece and India.

Like the TV series, the movie satirizes the bureaucracy and red tape which plague the Japanese police force, as well as certain elements of Japanese society, while at the same time avoiding falling into the typical formula of car chases and gunbattles that define most police dramas.

To Serenissimus such tribes as the Cossacks of the Don or those ex-bandits the Zaporogian Cossacks ( in whose islands along the lower Dnieper the Polish novelist Sienkiewicz would one day place With Fire And Sword ) were just elements for enforced resettlement in, say, Bessarabia, where, as `` the faithful of the Black Sea borders '', he could use their presence as bargaining points in the Czarina's territorial claims against Turkey.

Any free elections that were to be held in Poland would have to produce a government in which Moscow had complete confidence, and all pressure from the West for free voting by anti-Soviet elements in Poland would be met by restrictions on voting by these elements.

The affixed elements of collage were extruded, as it were, and cut off from the literal pictorial surface to form a bas-relief.

If the master of scops who was most responsible for the poem ever used kennings that were traditional, he was at least partly deprived of free will and not inclined towards shrewd and sophisticated misuse of speech elements.

Both elements -- the caution about a meeting, the willingness eventually to hold one -- were reflected in a letter from the President which Ambassador Llewellyn E. Thompson brought back to Russia late in February.

The elements that did were the introspective slow movement, the beautiful transition to the third movement, and the passages of filigree that laced through the bigger moments of the opening movement and the final Rondo.

All of the elements of the experience were impossible and yet the reality of them was heavy upon him and he resolved never again to visit the temple at Fudomae.

Neither Tylor nor Frazer, however, was particularly interested in fieldwork, nor were they interested in examining how the cultural elements and institutions fit together.

Besides iodine and tellurium, later several other pairs of elements ( such as argon and potassium, cobalt and nickel ) were known to have nearly identical or reversed atomic weights, leaving their placement in the periodic table by chemical properties to be in violation of known physical properties.

Another problem was that the gradual identification of more and more chemically similar and indistinguishable lanthanides, which were of an uncertain number, led to inconsistency and uncertainty in the numbering of all elements at least from lutetium ( element 71 ) onwards ( hafnium was not known at this time ).

A lot of religious elements including the were transmitted from the Hittites to the Greeks and then to the west.

The separation of curium and americium was so painstaking that those elements were initially called by the Berkeley group as pandemonium ( from Greek for all demons or hell ) and delirium ( from Latin for madness ).

As the chemical properties of the elements were known to largely repeat themselves according to the periodic law, in 1919 the American chemist Irving Langmuir suggested that this could be explained if the electrons in an atom were connected or clustered in some manner.

Isotopes were then explained as elements with the same number of protons, but different numbers of neutrons within the nucleus.

Other innovative elements were the construction of underground car parking and separate lifts and stairs for the owners and their servants.

Four elements were required at common law:

These four elements were eventually codified in most states.

The Alemanni thus were probably not primarily the Hermunduri, although some elements of them may have been present in the mix of peoples at that time that became Alemannian.

The city and its fortified sourroundings were encircled 13 September – 16 October 1944 by the US 1st Infantry Division and 3rd Armored Division in conjunction with the US 2nd Armored Division and 30th Infantry Division during the prolonged Battle of Aachen, later reinforced by US 28th Infantry Division elements.

Alcaeus himself seems to underscore the difference between his own ' down-to-earth ' style and Sappho's more ' celestial ' qualities when he describes her almost as a goddess ( as cited above ), and yet it has been argued that both poets were concerned with a balance between the divine and the profane, each emphasising different elements in that balance.

Lavoisier investigated the composition of water and air, which at the time were considered elements.

After the acceptance of Avogadro's hypothesis in 1860 it was understood that elements could exist as polyatomic molecules, and the two allotropes of oxygen were recognized as O < sub > 2 </ sub > and O < sub > 3 </ sub >.