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Of these, three elements (bismuth, thorium, and uranium) are primordial because they have half-lives long enough to still be found on the Earth, [d] while all the others are produced either by radioactive decay or are synthesized in laboratories and nuclear reactors. Only 13 of the 38 known-but-unstable elements have isotopes with a half-life ...
The densities of the carbon group elements tend to increase with increasing atomic number. Carbon has a density of 2.26 g·cm −3; silicon, 2.33 g·cm −3; germanium, 5.32 g·cm −3; tin, 7.26 g·cm −3; lead, 11.3 g·cm −3. [13] The atomic radii of the carbon group elements
Upon freezing, the volume of mercury decreases by 3.59% and its density changes from 13.69 g/cm 3 when liquid to 14.184 g/cm 3 when solid. The coefficient of volume expansion is 181.59 × 10 −6 at 0 °C, 181.71 × 10 −6 at 20 °C and 182.50 × 10 −6 at 100 °C (per °C).
The Munsell system describes a color in three dimensions, hue, value (lightness), and chroma (color purity), where chroma is the difference from gray at a given hue and value. By the middle 20th century, standardized methods for pigment chemistry were available, part of an international movement to create such standards in industry.
Popular culture (also called pop culture or mass culture) is generally recognized by members of a society as a set of practices, beliefs, artistic output (also known as popular art [cf. pop art] or mass art, sometimes contrasted with fine art) [1] [2] and objects that are dominant or prevalent in a society at a given point in time.
[6] [7] [8] Masks are important elements in the art of many people, along with human figures, and are often highly stylised. There is a wide variety of styles, often varying within the same context of origin and depending on the use of the object, but wide regional trends are apparent.
The result corresponds to 256 / 81 (3.16049...) as an approximate value of π. [3] Book 3 of Euclid's Elements deals with the properties of circles. Euclid's definition of a circle is: A circle is a plane figure bounded by one curved line, and such that all straight lines drawn from a certain point within it to the bounding line, are equal.
The elements of music feature prominently in the music curriculums of Australia, the UK, and the US. All three curriculums identify pitch, dynamics, timbre, and texture as elements, but the other identified elements of music are far from universally agreed upon. Below is a list of the three official versions of the "elements of music":