Technetium: the element of atomic number 43. Nature. 1947;159:24-25.Perrier, C. and Segre, E. 1947.: ‘Technetium: The element of atomic number 43’, Nature (Lond.) 159 , 24 pp.Technetium: the element of atomic number 43 - unknown authors - 1947...
atomic number44 atomic weight101.07 melting point2,250° C (4,082° F) boiling point3,900° C (7,052° F) specific gravity12.30 (20° C) valence1, 2, 3, 4, 5, 6, 7, 8 electron config.2-8-18-15-1 or (Kr)4d75s1
34 An element has an atomic number of 4.Which statement about this element is correct? A A It forms ions by losing electrons. B It has four occupied electron shells in each of its atoms. C It is an unreactive gas at room temperature and pressure. D It is found in Group IV of the...
The element with atomic number 14 is? A. Silicon B. Phosphorus C. Sulfur D. Chlorine 相关知识点: 试题来源: 解析 A。解析:原子序数为 14 的元素是硅元素。磷元素原子序数为 15,硫元素原子序数为 16,氯元素原子序数为 17。所以答案是 A。
atomic number14 atomic weight28.086 melting point1,410 °C (2,570 °F) boiling point3,265 °C (5,909 °F) density2.33 grams/cm3 oxidation state−4, (+2), +4 electron configuration1s22s22p63s23p2 Occurrence and distribution Earth's crust compositionThe mineral composition of Earth's crus...
What is the abbreviation for silicon? A. Si B. Sy C. Sg D. Sn 相关知识点: 试题来源: 解析 A。硅元素的英文是 silicon,其缩写形式是 Si。选项 B“Sy”不是硅元素的缩写;选项 C“Sg”一般不是任何化学元素的缩写;选项 D“Sn”是锡元素的缩写。反馈 收藏 ...
6 (a) An element X has an atomic number of 24 and a relative atomic mass of52.06. The natural element consists of four isotopes. The mass spectrum of the element X produced the following peaks of three of the isotopes on the chart recorder.Percentage83.804.302.4050 51 52 53 54 55 56...
1) An element with : 44 atomic number 102 atomic mass What is the element? Express your answer as an isotope. 2) An element with : 52 atomic number 126 atomic mass What is the element? What are the atomic number and mass number of bromine-79?
What element has the atomic number 74?Numbered Mass:The atomic number of an element refers to the number of protons/electrons located in the nucleus of an atom of that element. The atomic mass is the sum of the number of protons and the number of neutrons....
Synthesis of a New Element with Atomic Number Z=117 The discovery of a new chemical element with atomic number Z=117 is reported. The isotopes (293)117 and (294)117 were produced in fusion reactions between ... TO Yu,FS Abdullin,PD Bailey,... - 《Physical Review Letters》...