原子序数

According to the function, the shielding coefficient of electron of high ionized atom can be obtained.

计算了原子序数13至23的元素高电荷态离子基态电离能，计算结果与文献可提供的实验数据相符合。

People through nuclear reactions, have been synthesized 17 kinds of atomic number greater than 92 of the transuranic elements, and thousands of The new kinds of radioactive nuclides, and by high-energy and ultra-high energy-ray beam and the interaction of atomic nuclei and found hundreds of kinds of short-lived particles, namely, baryon, meson, lepton, and particle resonance states of these particles has led to a new field of study - the birth of particle physics since the age of .70, nuclear physics has entered a deep development and wide application of new, more mature stage, on the one hand the development of particle acceleration and detection techniques, expanding people's research in nuclear means, the other hand, nuclear technology to serve the national economy, for example, for the development and utilization of nuclear energy to provide more accurate nuclear data; the use of isotope tracer technique diagnosis and treatment of disease; the use of radiation and irradiation preservation of food, irradiation breeding .

人们通过核反应，已经人工合成了17种原子序数大于92的超铀元素和上千种新的放射性核素，并且通过高能和超高能射线束和原子核的相互作用，发现了上百种短寿命粒子、即重子、介子、轻子和共振态粒子，对这些粒子的研究导致了一门新学科——粒子物理学的诞生。70年代以来，核物理进入了纵深发展和广泛应用的新的更成熟的阶段，一方面发展粒子的加速技术和探测技术，扩充人们研究原子核的手段，另一方面将核技术服务于国民经济中，例如，为核能的开发利用提供更为准确的核数据；利用同位素示踪技术诊断和治疗疾病；利用射线及辐照技术保存食品、辐照育种等。

Radioisotope means the nuclide in a certain element with radioactive decay, which has the same ordinal number of atoms but different mass.

放射性同位素，是指某种发生放射性衰变的元素中具有相同原子序数但质量不同的核素。

Group in periodic table with silver-white metallic luster of the solid metal transition elements, but also one of the platinum group element, atomic number Z = 44, atomic weight of 10107, the chemical symbol F No.

周期表中Ⅷ族银白色具金属光泽的固体金属过渡元素，又是铂系元素之一，原子序数Z＝44，原子量10107，化学符F号Ru。

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.

周期表中Ⅷ族有银白色金属光泽的固体金属过渡元素，原子序数Z＝26，原子量55847，化学符号Fe，有一种稳定F同位素5626Fe和一种放射性同位素5526Fe，地壳中含量5％，占元素中第四位、金属中第二位熔点1535℃，沸点2750℃，相对密度786，外围电子结构3d64s2，化学反应时易丢失2—6个电F子，氧化数为0、＋2、＋3、＋4、＋5和＋6、化学性质很活泼的金属元素，在潮湿空气中能与氧化合，也能直接与硫、磷、硅、碳化合。

With passive methods of CR-39 and TE/C ion chamber, the photoneutron dose at the isocenter was 0.19mSv/Gy X-ray and 0.06mSv/Gy X-ray.

在 一般的工业用或医用电子加速器中，韧致辐射靶、用于屏蔽和准直光子的材料多是高原子序数的材料。

The number of protons in the nucleus of an atom is referred to as the atomic number, or proton number, Z.

原子核内质子的数目即原子序数或称质子数，用Z表示。

The density measurement technology of foam material with low atomic number was established by low energy X-ray radioscopy.

采用低能X射线对低原子序数泡沫样品进行透射照相，以胶片作为记录介质，对材料密度进行测量。

1913 IsotopeOne of two or more atoms that have the same atomic number, but a different number of neutrons, Coined by Frederick Soddy.

同位素是指原子序数相同中子数不同的元素。这个词是由弗雷德里。索蒂（1877－1956，英国化学家，1921年获诺贝尔奖金）创造的。 fys中国英语学习网

However, even the atomic number as high as 94, there is no stable nuclei are the same elements found in nature, and this is the natural decay of uranium and thorium.

可是，即使是原子序数高达94，没有稳定原子核的元素都一样能在自然中找到，这就是铀和钍的自然衰变。

The split between the two groups can hardly be papered over.

这两个团体间的分歧难以掩饰。

This approach not only encourages a greater number of responses, but minimizes the likelihood of stale groupthink.

这种做法不仅鼓励了更多的反应，而且减少跟风的可能性。