Chemical properties The name indicates the mass of an atom, expressed in atomic mass units (amu). Most of the mass of an atom is concentrated in the protons and neutrons contained in the nucleus. Each proton or neutron weighs about 1 amu, and thus the atomic mass in always very close to...
3) Elements and compounds 元素及其化合物 例句>> 4) the propertics of element and compond substances 元素化合物性质5) Inorganic element compounds 无机元素化合物6) elementary organic compounds 元素有机化合物补充资料:元素 分子式:CAS号:性质:含义比较广泛。(1)指化学元素,同一元素具有相同的核电荷...
The Chemical Elements and their Compounds: an Introduction to the Study of Inorganic Chemistry from Modern Stand pointsTHE merits of a book on atomic and molecular structure can be judged by a very simple test. If the book merely gives an account of the personal views and impressions of the ...
A chemical element and its compounds in the natural state or obtained by any manufacturing process, including any additive [...] lubrizol.com 指自然状态的或通过生产过程获得 的化 学 元 素及 其化 合物 ,包括为保持其稳定性而使用的添加剂和生产过程中产生的杂质,但不包括任何在不影响稳定性或...
Chemical bonds bind elements together to form compounds. Chemical bonding occurs because atoms are most stable when their outer electron shell-also called the valence shell- is either completely full or empty. Covalent bonds form when atoms team up to fill their valence shells by sharing their out...
Thesmallestunitofacompoundthatretainsthechemicalcharacteristicsofthecompound. Compounds-areacombinationof2ormoreelementsindefiniteratiosbymass.Thecharacterofeachelementislostwhenformingacompound.3.1DefinitionsChapter3ChemicalbondingandChapter3ChemicalbondingandCompoundsCompoundsProblemsandquestions— Howisamoleculeorpolyatomic...
used to indicate the relative level of severity of hazard (3.5) and alert the reader to a potential hazard on the label EXAMPLES In the GHS, “danger” and “warning” are used as signal words. NOTE Adapted from GHS:20072 , 1.2. 3.17 substance chemical elements and their compounds in ...
heavy metalandchemical compoundcontained in treated fuel ashes generated by power stations; if it had, of the outcome; if not, the reasons for that; whether it knows if fuel ashes disposed of at collection sites contain heavy metalandchemical compounds;ifso, of their ...
trace elements not included in atom-type and atom-site lists should not be included in this formula (see also _chemical_formula_analytical). 无机物、有机金属、金属配合物等的化学式书写规则,请参阅CHEMICAL_FORMULA类别描述,其中键合基团作为离散实体保留在括号内,并根据需要使用后乘数。元素的顺序应该提供...
The present invention relates to therapeutically active piperidine derivatives (I), a method of preparing the same and to pharmaceutical compositions comprising the compounds. The compounds are useful in the treatment of indications related to the CNS-system, cardiovascular system or to gastrointestinal ...