![]() ![]() Images © Murray Robertson 1999-2011 Text © The Royal Society of Chemistry 1999-2011 Political stability of top reserve holderĪ percentile rank for the political stability of the country with the largest reserves, derived from World Bank governance indicators. The higher the value, the larger risk there is to supply.Ī percentile rank for the political stability of the top producing country, derived from World Bank governance indicators. The percentage of the world reserves located in the country with the largest reserves. The higher the value, the larger risk there is to supply. ![]() The percentage of an element produced in the top producing country. Low = substitution is possible with little or no economic and/or performance impact Medium = substitution is possible but there may be an economic and/or performance impact High = substitution not possible or very difficult. The availability of suitable substitutes for a given commodity. A higher recycling rate may reduce risk to supply. The percentage of a commodity which is recycled. ![]() The number of atoms of the element per 1 million atoms of the Earth’s crust. This is calculated by combining the scores for crustal abundance, reserve distribution, production concentration, substitutability, recycling rate and political stability scores. The Chemical Abstracts Service registry number is a unique identifier of a particular chemical, designed to prevent confusion arising from different languages and naming systems.ĭata for this section been provided by the British Geological Survey.Īn integrated supply risk index from 1 (very low risk) to 10 (very high risk). Where more than one isotope exists, the value given is the abundance weighted average.Ītoms of the same element with different numbers of neutrons. This is approximately the sum of the number of protons and neutrons in the nucleus. The mass of an atom relative to that of carbon-12. The transition of a substance directly from the solid to the gas phase without passing through a liquid phase.ĭensity is the mass of a substance that would fill 1 cm 3 at room temperature. The temperature at which the liquid–gas phase change occurs. The temperature at which the solid–liquid phase change occurs. The arrangements of electrons above the last (closed shell) noble gas. These blocks are named for the characteristic spectra they produce: sharp (s), principal (p), diffuse (d), and fundamental (f). The atomic number of each element increases by one, reading from left to right.Įlements are organised into blocks by the orbital type in which the outer electrons are found. Members of a group typically have similar properties and electron configurations in their outer shell.Ī horizontal row in the periodic table. The units in the SI and CGS systems are interconvertible so they can be easily converted from one form to another.A vertical column in the periodic table. However g/ mol is commonly used for calculations. The molar mass is the intensive property and it depends on the size of the sample. The average is usually taken due to the presence of the isotopes in the sample. Usually the amount is calculated in moles, thus molar mass is a bulk property and not the molecular property. The molar mass of the compound is the amount of the mass of the sample of that compound divided by the amount of the substance in that sample. Thus, the mass of nitrogen in 1 Kg or 1000 gram of ammonium nitrate will be: Thus in the 80 grams of ammonium nitrate as it is evident from the formula 2 nitrogen atoms are present, thus the molecular mass of the nitrogen atoms will be: The nitrogen atom has a lone pair of electron in its structure of ammonia molecule.Ĭomplete answer: The ammonium nitrate is basic in nature and it has the molecular formula:$N$and its molecular weight is 80 grams. Hint: Nitrogen is the most abundant element found in the earth crust and is the element number 7 of the periodic table it has electronic configuration of 2, 5 and is the non- metal in nature. ![]()
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