Free Chemistry Periodic Table 2020

【图】Free Chemistry Periodic Table 2020下载
【图】Free Chemistry Periodic Table 2020-安卓下载

Free Chemistry Periodic Table 2020 简介

Free Chemistry Periodic Table 2020 is a tabular arrangement of the chemical elements, ordered by their atomic number, electron configuration, and recurring chemical properties, whose structure shows periodic trends. Generally, within one row (period) the elements are metals to the left, and non-metals to the right, with the elements having similar chemical behaviours placed in the same column. Table rows are commonly called periods and columns are called groups. Six groups have accepted names as well as assigned numbers: for example, group 17 elements are the halogens; and group 18 are the noble gases. Also displayed are four simple rectangular areas or blocks associated with the filling of different atomic orbitals.

The organization of the periodic table can be used to derive relationships between the various element properties, but also the predicted chemical properties and behaviours of undiscovered or newly synthesized elements. Russian chemist Dmitri Mendeleev was the first to publish a recognizable periodic table in 1869, developed mainly to illustrate periodic trends of the then-known elements. He also predicted some properties of unidentified elements that were expected to fill gaps within the table. Most of his forecasts proved to be correct. Mendeleev’s idea has been slowly expanded and refined with the discovery or synthesis of further new elements and the development of new theoretical models to explain chemical behaviour. The modern periodic table now provides a useful framework for analyzing chemical reactions, and continues to be widely used in chemistry, nuclear physics and other sciences.

All the elements from atomic numbers 1 (hydrogen) through 118 (oganesson) have been either discovered or synthesized, completing the first seven rows of the periodic table. The first 98 elements exist in nature, although some are found only in trace amounts and others were synthesized in laboratories before being found in nature. Atomic numbers for elements 99 to 118 have only been synthesized in laboratories or nuclear reactors. The synthesis of elements having higher atomic numbers is currently being pursued: these elements would begin an eighth row, and theoretical work has been done to suggest possible candidates for this extension. Numerous synthetic radionuclides of naturally occurring elements have also been produced in laboratories.

Each chemical element has a unique atomic number (Z) representing the number of protons in its nucleus. Most elements have differing numbers of neutrons among different atoms, with these variants being referred to as isotopes. For example, carbon has three naturally occurring isotopes: all of its atoms have six protons and most have six neutrons as well, but about one per centhas seven neutrons, and a very small fraction have eight neutrons. Isotopes are never separated in the periodic table; they are always grouped together under a single element. Elements with no stable isotopes have the atomic masses of their most stable isotopes, where such masses are shown, listed in parentheses.

Free Chemistry Periodic Table 2019 enables you to understand and search for all elements and you can also find their details in it.

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Free Chemistry Periodic Table 2020 中文简介

自由化学元素周期表2020是化学元素的表格排列,按原子序数,电子构型和循环化学性质排序,其结构显示周期性趋势。通常,在一排(周期)内,元素是左侧的金属,而右边是非金属,具有相似化学行为的元素放在同一列中。表行通常称为句点,而列称为组。六组已接受名称和分配编号:例如,第17组元素为卤素;和第18组是稀有气体。还显示了与填充不同原子轨道相关的四个简单矩形区域或块。

元素周期表的组织可用于导出各种元素性质之间的关系,还可以得出未发现或新合成元素的预测化学性质和行为。俄罗斯化学家德米特里·门捷列夫(Dmitri Mendeleev)于1869年首次发布了可识别的元素周期表,其主要目的是说明当时已知元素的周期性趋势。他还预测了未识别元素的某些属性,这些属性有望填补表格中的空白。他的大多数预测都被证明是正确的。随着进一步的新元素的发现或合成以及解释化学行为的新理论模型的发展,门捷列夫的思想逐渐得到扩展和完善。现在,现代元素周期表为分析化学反应提供了有用的框架,并继续广泛用于化学,核物理和其他科学领域。

已经发现或合成了原子序数为1(氢)至118(奥加西松)的所有元素,从而完成了元素周期表的前七行。前98种元素存在于自然界中,尽管其中一些仅以痕量被发现,而另一些则是在实验室中合成后才被发现的。元素99至118的原子序数仅在实验室或核反应堆中合成。当前正在追求具有更高原子序数的元素的合成:这些元素将开始第八行,并且已经进行了理论工作来建议这种扩展的可能候选者。实验室还生产了许多天然元素的合成放射性核素。

每个化学元素都有一个唯一的原子序数(Z),代表其原子核中的质子数。大多数元素在不同原子之间具有不同数量的中子,这些变体被称​​为同位素。例如,碳具有三种自然存在的同位素:其所有原子都有六个质子,大多数原子也有六个中子,但是大约有百分之一的中子有七个中子,非常小的一部分有八个中子。同位素在元素周期表中永远不会分离;它们始终归为一个元素。没有稳定同位素的元素具有其最稳定同位素的原子质量,在括号中列出了此类质量的显示位置。

免费化学元素周期表2019使您能够理解和搜索所有元素,还可以在其中找到其详细信息。

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