Atomic number Z = 25, atomic weight of 54938, the chemical symbol Mn, only the F there is a stable isotope, radioactive short-lived, there are three kinds of allotrope α,β,γ.

原子序數(shù)Z＝25日本超碰在线免费观看一级，原子量54938，化學(xué)符號(hào)為Mn，只F有一種穩(wěn)定同位素，放射性的壽命很短日批视频免费，有三種同素異形體α、β九九精品在线视频在线观看、γ91精品国产无水印在线观看。

Products Introduction: Silicon cycle, the department of the first type IV elements, is a non-metallic element, atomic number 14, atomic weight 28.80; density of 2.33g/m3; melting point of 1410 ℃; boiling point of 2355 ℃; resistively for 2140Ω.M; includes two types of stereotypes and crystal allotrope.

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Alpha decay commonly occurs in elements with atomic numbers greater than 83, but can occur in some rare-earth elements in the atomic-number range of 60 to 71.

發(fā)射α粒子的主要是重于鉍(lutetium国产aav，原子序數(shù)83)和從釹(neodymium，原子序數(shù)60)到鎦(Iutetium亚洲精品一二三区尤物tv，原子序數(shù)71)的稀土元素成长黄色在线视频免费，α衰變的半衰期，從1微秒(10-6秒)到約1017秒av黄色电影免费日韩。

What is represented by the symbol AZX is an atomic species called a nuclide of the element X, having an atomic number Z and a mass number A.

符號(hào)AZX代表的是元素X的一種核素毛片一级一区免费网站，其原子序數(shù)是Z，質(zhì)量數(shù)為A国产伦精品一区二区三区娃女。

They have the same atomic number and hence nearly identical chemical behaviour but different atomic masses.

它們有相同的原子序數(shù)95热全部视频在线观看，因此化學(xué)行為幾乎完全一樣，但原子量不同劲爆国产一区在线。

Lead (atomic number 82) and gold (atomic number 79) are defined as elements by the number of protons they possess.

鉛（原子數(shù)82）和金（原子數(shù)79）都是根據(jù)所擁有的質(zhì)子數(shù)定義的"元素"欧美日韩国产一级婬片。

Xenon is the element with the larger atomic number in inert gase , atomic radius is bigger.

氙是惰性氣體中原子序數(shù)較大的元素，原子半徑較大人人操人人干人人插久久。

"When the objective lab scores and the subjective ocean scores are combined, the Atomic Aquatics regulators come out number one."

將客觀的實(shí)驗(yàn)室評(píng)分以及主觀的海洋實(shí)地測(cè)試評(píng)分加在一起欧美一级片手机免费观看，Atomic調(diào)節(jié)器脫穎而出得到第一名欧美曰韩视频。

Lanthanides belong to the sixth cycle of the periodic table Ⅲ B family, are all solid metal, they are La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, holmium, erbium, thulium, ytterbium, and lutetium were 15 kinds of metals and their periphery are two layers of electronic 5d16s2, while the peripheral third layer f orbital but never zero to 14, so the external electronic structure of 4f0-145d16s2, and therefore these elements in oxidation number are to 3, very close chemical properties, extraction, when it is difficult to separate them they are mostly multi-element mineral mix, more difficult to increase refining, and their atomic number of 57-71, one by one to increase the number of protons the nucleus, and thus extranuclear electron of gravity is also growing, so that atomic radius decreases with increasing atomic number Z, which makes lanthanides contraction, ionic radius is also reduced, which also makes Zr, Hf, Nb and Ta, Mo and W, the atom and ionic radius very close to each other they also determine a similar nature, resulting in difficult separation, also the tribe Ⅷ of the fifth cycle, ruthenium, rhodium, palladium, and the sixth cycle, osmium, iridium, platinum is very similar in nature, thus The six elements, said platinum group elements.

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Group in the periodic table there are silver-white metallic luster of the solid metal transition element, atomic number Z = 26, atomic weight of 55847, chemical symbol Fe, there is a stable F isotope 5626Fe and a radioisotope 5526Fe, content of 5% of the earth's crust, accounting for elements of in the fourth place, the metal in the second melting point 1535 ℃, boiling point 2750 ℃, the relative density of 786, the external electronic structure 3d64s2, chemical reactions 2-6 tram F-volatile son, oxidation number of 0, 2, 3, 4 , 5 and 6, the chemical nature of the metal element is very lively, in the humid air combined with oxidation, but also directly with the sulfur, phosphorus, silicon, carbon together.

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