What's the difference between 'fascism' and 'socialism'? More Commonly Misspelled Words Words You Always Have to Look Up Popular in Wordplay See All 8 Words with Fascinating Histories 8 Words for Lesser-Known Musical Instruments Birds Say the Darndest Things ...
TableiscalledaPeriod.3 Period1 WhyareHydrogenandHeliuminPeriod1ofthePeriodicTable?4 Period1 H:1Examinetheirelectronicstructure.BothHydrogenand H Heliumhaveonly1shell intheirelectronic structure.Thus,HandHe areinPeriod1.He:2He 5 Period2 Li:2.1 B:2.3 N:2.5 F:2.7 ...
元素周期表专业版(Periodic Table PRO)是一款专门为化学这门学科打造的一款专业的元素周期表学习软件,有了他你就能够随时把元素周期表带在身上,元素周期表想背就背,不浪费任何学习的机会。元素周期表专业版提供了每个元素的详细资料、元素分类及元素背诵口诀此引用可满足中学到大学师生及化学专业人士的使用需求所有元素...
1.2 周期 - Period 周期表上的一个横行为一个周期,从上往下数,用阿拉伯数字表示,从1开始。 例如第一行是“第一周期(period 1)”,第六行是“第六周期(period 6)”。 1.3 族 - Group 元素周期表上的竖列被称为族。最新的相关标准规定元素周期表从左至右一竖列为一族,用阿拉伯数字指代, 例如第4族(group...
In the periodic table the elements are arranged into periods andgroups. A row of elements across the table is called a period. Each period hasa number: from 1 to 7. Period 1 has only 2 elements in it: hydrogen and helium. Period 2 and Period 3both have 8 elements. Other periods are...
PERIOD 1 1 IA 1.008 18 2 Group IUPAC 2 4 IIA 9.01 1 1 Group CAS IA 1.008 VIIIA 4 1 H Hydrogen 3 6.94 Atomic Number Atomic Mass Atomic Symbol 2 Li 11 Lithium 22.99 Be Beryllium 12 24.31 H Hydrogen Atomic Name Metal Alkaline Metal Alkaline Earth Metal Transition Metal Lanthanide ...
Rows of elements are called periods.The period numberof an element signifies the highest unexcited energy level for an electron in that element. The number of elements in a period increases as you move down the periodic table because there are more sublevels per level as the energy levelof th...
period 3 Na Mg Al Si P S period 4 K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr period 5 Rb I Xe (iii) The horizontal row in the Periodic Table is called period.Elements in the same period have the same number of electron shells. E.g.sodium (Na: 2.8.1) ...
Periodic Table概述 Elements 1Hydrogen 氢 1H:period1,groupIA/1,nonmatel 原子量1.00794电离能1312.0eV电负性2.20氧化态+1,-1电子构型1s1原子半径0.79Å离子半径0.012Å熔点-258.975︒C沸点-252.732︒C氢是一种化学元素，在元素周期表中位于第一位。氢通常的...
In the periodic table of the elements, elements are arranged in a series of rows (or periods) so that those with similar properties appear in vertical columns. Elements of the same period have the same number of electron shells; with each group across a period, the elements have one more ...