Compressibility (also known as the coefficient of compressibility is a measure of the relative volume change of a fluid or solid as a response to a pressure (or mean stress) change. This effect is caused by a decrease in the atomic number density. We assume no responsibility for consequences which may arise from the use of information from this website. The density of a material varies with temperature and pressure. Phone: +971 4 429 5853 e-mail:, Copyright © 1998-2020 Lenntech B.V. All rights reserved, Plant Inspection & Process Optimalisation, Separation and Concentration Purification Request. Mass was no longer considered unchangeable in the closed system. As a result of this expansion, the density of most materials decreases. Distributieweg 3 2645 EG Delfgauw The Netherlands Phone: +31 152 610 900 fax: +31 152 616 289 e-mail:, 5975 Sunset Drive South Miami, FL 33143 USA Phone: +1 877 453 8095 e-mail:, Level 5 - OFFICE #8-One JLT Tower Jumeirah Lake Towers Dubai - U.A.E. Consequently, the smallest atom is helium with a radius of 32 pm, while one of the largest is caesium at 225 pm. These electrons together weigh only a fraction (let say 0.05%) of entire atom. It is an intensive property, which is mathematically defined as mass divided by volume: The atom consist of a small but massive nucleus surrounded by a cloud of rapidly moving electrons. Since the density (ρ) of a substance is the total mass (m) of that substance divided by the total volume (V) occupied by that substance, it is obvious, the density of a substance strongly depends on its atomic mass and also on the atomic number density (N; atoms/cm3). It is the Pauli exclusion principle that requires the electrons in an atom to occupy different energy levels instead of them all condensing in the ground state. Units of measure have been defined for mass and energy on the atomic scale to make measurements more convenient to express. Therefore, there are various non-equivalent definitions of atomic radius. For this purposes, a dimensionless quantity the Pauling scale, symbol χ, is the most commonly used. It has an estimated density of 40.7 x 103 kg/m3. It explains how we use cookies (and other locally stored data technologies), how third-party cookies are used on our Website, and how you can manage your cookie options. One unified atomic mass unit is approximately the mass of one nucleon (either a single proton or neutron) and is numerically equivalent to 1 g/mol. The mention of names of specific companies or products does not imply any intention to infringe their proprietary rights. Symbol of an element represents the specific element and also represents one atom of that element. One atomic mass unit is equal to 1.66 x 10-24 grams. Potassium is a soft, silvery-white metal, member of the alkali group of the periodic chart. In the periodic table, the elements are listed in order of increasing atomic number Z. Potassium was first isolated from potash, the ashes of plants, from which its name derives. See also: Atomic Mass Number – Does it conserve in a nuclear reaction? The standard SI unit is kilograms per cubic meter (kg/m3). As such, the element is required in relatively large proportions by the growing plant. Atomic Number – Does it conserve in a nuclear reaction? The second part of the name comes from the root of the second symbol plus '-ide,' therefore chlor+ ide= chloride. It has a role as a human metabolite and a cofactor. The chemistry of potassium is almost etirely that of the potassium ion, K+. In all cases it is the negative anion, not the potassium, which is the key to their use. Potassium carbonate goes into glass manufacture, expecially the glass used to make televisions, while potassium hydroxide is used to make liquid soaps and detergents. This can lead to disturbing heartbeats. The short name of the element is called symbol. If we include man made elements, the densest so far is Hassium. The electronegativity of Potassium is: χ = 0.82. High water soluble levels of potassium cause damage to germinating seedlings, inhibits the uptake of other minerals and reduces the quality of the crop. The Standard English unit is pounds mass per cubic foot (lbm/ft3). Today most potassium minerals come from Canada, USA and Chile. On the atomic scale, physicists have found that quantum mechanics describes things very well on that scale. Potassium, as the ion K+, concnetrate inside cells, and 95% of the body's potassium is so located. The atomic radius of a chemical element is a measure of the distance out to which the electron cloud extends from the nucleus. The atomic radii decrease across the periodic table because as the atomic number increases, the number of protons increases across the period, but the extra electrons are only added to the same quantum shell. Hassium is a chemical element with symbol Hs and atomic number 108. It is the electrons that are responsible for the chemical bavavior of atoms, and which identify the various chemical elements. Most potassium occurs in the Earth's crust as minerals, such as feldspars and clays. Particle locations in quantum mechanics are not at an exact position, they are described by a probability density function. Increasing the pressure on an material (especially for liquids or gases) decreases the volume of the object and thus increases its density via the atomic number density. The classical description cannot be used to describe things on the atomic scale. The main mining area used to be Germany, which had a monopoly of potassium before the first World War. Together with nitrogen and phosphorous, potassium is one of the essential macrominerals for plant survival. Skin and eye contact can cause severe burns leading to permanent damage. The atomic radius of Potassium atom is 203pm (covalent radius). For example, 63Cu (29 protons and 34 neutrons) has a mass number of 63 and an isotopic mass in its nuclear ground state is 62.91367 u. This dependence is usually expressed by the coefficient of linear or volume expansion. On the periodic table of the elements, atomic radius tends to increase when moving down columns, but decrease when moving across rows (left to right). The atomic mass is carried by the atomic nucleus, which occupies only about 10-12 of the total volume of the atom or less, but it contains all the positive charge and at least 99.95% of the total mass of the atom. If you want to get in touch with us, please do not hesitate to contact us via e-mail: Copyright 2020 Periodic Table | All Rights Reserved |. Learn more about Quia: Create your own activities Our Website follows all legal requirements to protect your privacy. The chemical symbol K comes from kalium, the Mediaeval Latin for potash, which may have derived from the arabic word qali, meaning alkali. 2) You may not distribute or commercially exploit the content, especially on another website. The information contained in this website is for general information purposes only.