推荐回答(5个)
前20号元素,元素原子最外层电子排布、原子半径、主要化合价的周期性变化。
某些特殊元素,像卤族元素,金属性最强的元素。
21~30的元素原子外围电子排列要知道,第五周期以前,包括第五周期的主族元素。
了解元素周期 表的结构(周期、族),知道金属、非金属在周期表中的位置。
以第三周期元素为例,熟记同周期元素性质递变规律与原子结构的关系。
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拓展资料:
元素周期表是根据原子序数从小至大排序的化学元素列表。列表大体呈长方形,某些元素周期中留有空格,使特性相近的元素归在同一族中,如碱金属元素、碱土金属、卤族元素、稀有气体等。这使周期表中形成元素分区且分有七主族、七副族、Ⅷ族、0族。
参考链接:百度百科-元素周期表
前二十位必须会,然后主族和副族的元素也要背下来。
口诀
氢锂钠钾铷铯钫——请李娜加入私访
铍镁钙锶钡镭 ——媲美盖茨被雷
硼铝镓铟铊 ——碰女嫁音他
碳硅锗锡铅 ——探归者西迁
氮磷砷锑铋 ——蛋临身体闭
氧硫硒碲钋 ——养牛西蹄扑
氟氯溴碘砹 ——父女绣点爱
氦氖氩氪氙氡 ——害耐亚克先动
化学元素周期表根据原子序从小至大排序的化学元素列表。列表大体呈长方形,某些元素周期中留有空格,使特性相近的元素归在同一族中,如卤素、碱金属元素、惰性气体、放射性元素等。这使周期表中形成元素分区。由于周期表能够特性及其之间的关系,因此它在化学及其他科学范畴中被广泛使用,作为分析化学行为时十分有用的框架。现代的周期表由俄国化学家门捷列夫于1869年(己巳年)创造,用以展现当时已知元素特性的周期性。自此,随着新元素的探索发现和理论模型的发展,周期表的外观曾经过改变及扩张。 一个国际科研小组2014年5月2日声明,他们利用新实验成功证实了117号元素的存在,这一成果使得该超重元素向正式加入元素周期表更近了一步。
初中阶段的要背就是1-20号元素的名称、符号
了解周期表的基本结构: 7横行(周期)18纵行(16族)
再把常用的元素的相对原子质量记住就好了~
高中需要的就多了,前36号元素,每一族的元素,以及其递变规律(元素周期律),这是文理科生都要知道的常识喽~,到时候还分为:碱金属、卤族元素、稀有气体等等...
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解答:理科生是到第36号元素,文科是前20。
前36我给发下
1 H氢相对质量: 1.00794(7)
2 He氦4.002602(2)
3 Li锂6.941(2)
4 Be铍9.012182(3)
5 B 硼10.811(7)
6 C 碳12.0107(8)
7 N 氮14.0067(2)
8 O氧15.9994(3)
9 F 氟18.9984032(5)
10 Ne氖20.1797(6)
11 Na钠22.98976928(2)
12 Mg镁24.3050(6)
13 Al铝26.9815386(8)
14 Si硅28.0855(3)
15 P磷30.973762(2)
16 S硫32.065(5)
17 Cl氯35.453(2)
18 Ar氩39.948(1)
19 K 钾39.0983(1)
20 Ca钙40.078(4)
21 Sc钪44.955912(6)
22 Ti钛47.867(1)
23 V钒50.9415(1)
24 Cr铬51.9961(6)
25 Mn锰54.938045(5)
26 Fe铁55.845(2)
27 Co钴58.933195(5)
28 Ni镍58.6934(4)
29 Cu铜63.546(3)
30 Zn锌65.38(2)
31 Ga镓69.723(1)
32 Ge锗72.64(1)
33 As砷74.92160(2)
34 Se硒78.96(3)
35 Br溴79.904 (1)
36 Kr氪83.798(2)
1、高中最常用的还是前20号元素。
2、一般横向记忆需要记到35或36(溴)号元素。
3、要记的就是每个周期各有多少种元素,每主族有哪些元素。
4、竖向记忆需要记得每一主族有哪些元素包括0族元素。
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