1 氢 H 1.007 94(7)
2氦He 4.002 602(2)
3 lithium Li 6.941（2）
4铍Be 9.012 182(3)
5 boron B 10.811 (7)
6碳c 12.017(8)
7 氮 N 14.006 7(2)
8氧OR 15,999 4(3)
9.2 Fluorine F 18998 403 (5)
10 氖 Ne 20.179 7（6）
12镁mg 24.305 0(6)
14 Si 28.085 5 (3)
15 磷 P 30.973 762(2)
16 sulfur S 32.065 (5)
17氯cl 35.453(2)
18 氩 on 39.948(1)
19 钾 K 39.098 3(1)
20 ticed Ca 40.078(4)
21钪 Sc 44.955 912(6)
22 钛 Ti 47.867(1)
23钒V 50.941 5(1)
24铬Cr 51.996 1(6)
25 锰 Mn 54.938 045(5)
26铁Fe 55.845(2)
27 钴 Co 58.933 195(5)
28 subtitles 58,693 4(2)
29铜铜63.546(3)30锌锌65.409(4)31镓Ga 69.723(1) 32锗通用电气74.921 72.64(1)33砷60(2)34硒Se 78.96(3) 35溴Br 79.904(1) 36氪Kr 83.798(2) 37铷Rb 85.467 8(3) 38锶Sr 39钇Y 88.905 85 87.62(1)(2) 40锆、锆91.224(2)41铌Nb 92.906 38(2) 42钼钼95.94(2)43锝Tc[97.9072] 44钌俄文50 101.07(2)45铑Rh 102.905(2) 46钯Pd 106.42(1) 47银Ag) 107.868 - 2(2) 48镉Cd 112.411(8) 49铟在114.818(3)50锡Sn 118.710(7) 51锑某人121.760(1)52碲Te 127.60(3) 53岁碘126.904我47(3)54氙Xe 131.293(6) 55铯Cs 132.905 451 9(2) 56钡英航137.327(7)57镧La 138.905 47(7) 58铈Ce 140.116(1) 59公关140.907 65(2)60钕镨钕144.242(3)61钷点[145]62钐Sm 150.36 151.964(1)(2) 63年欧盟铕钆Gd 64 157.25(3) 35(2) 66 158.925 65铽结核病镝Dy 162.500(1) 67钬Ho 164.930 32(2) 68铒Er 167.259(3) 69年铥Tm 168.934 21(2) 70镱Yb 173.04(3) 71年陆镥174.967(1)72年铪高频178.49 (2)73 180.947 88 (2)74 W钨钽Ta 183.84(1) 75铼186.207(1)76锇Os 190.23(3) 77铱红外192.217(3)78铂Pt 195.084(9) 79金盟196.966 569(4)80汞Hg 200.59(2) 81铊Tl 204.383 3(2) 82铅铅207.2(1)83铋Bi 208.980 84(1)钋85砹Po(208.982 - 4) 86年(209.987 - 1)氡Rn 222.017[6] 87年钫Fr[223] 88年镭再保险锕Ac[227][226] 89 90 232.038钍Th 06(2) 91年镤Pa 88 - 231.035(2) 92年铀U 91 - 238.028(3) 93镎Np 94钚Pu[244] 95[237]镅是[243]96[247]锔厘米97锫bk 98锎cf[251] 99[247]锿Es镄fm 100[252][257] 101钔Md [258]102锘铹Lr不[259]103[262]104钅卢射频[261]105钅杜db[262] 106钅喜Sg[266] 107钅波Bh 108年[264]钅黑Hs[277] 109钅麦太[268]110钅达Ds[271] 111錀Rg[272] 112号Uut 113 [285] [284] 114 Uuq[289] 115统一党Uuh 116[288][292] 117年唯一神论者Uuo 118 [291] [293]
The atomic mass of lithium is 6.941.
The chemical symbol of lithium Li, the lightest metal in nature, silver-white, in the periodic table in group IA, the first alkali metal, atomic number 3, body-centered cubic crystals, the common valence of 1.
The chemical properties of lithium metal are very active, and under certain conditions, it can react with most metals and nonmetals except rare gases, but it is not as easy as other alkali metals because it loses an electron at this time, and its outer electronic structure is stable. You can compare it to sodium. Lithium can be generated and burned, with flammability, and the intensity of burning is unmatched by other alkali metals. It's very corrosive.
The atomic mass of li is 7. Lithium (Li) is a silver-white metallic element, soft and the least dense metal. Used in atomic reactors, light alloys and batteries. Lithium and its compounds are not as typical as other alkali metals, because lithium has a high charge density and a stable helium-type double electron shell, which makes lithium easily polarized other molecules or ions, but is not easily polarized itself.
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Since the actual mass of atoms is very small, it is very troublesome if one uses their actual mass to calculate, for example, the actual mass of a hydrogen atom is 1.674×10. 2? The kilogram, the mass of an oxygen atom is 2.657 x 10? 2? Kilograms. The mass of a carbon-12 atom is 1.993×10. 2? Kilograms. The relative atomic mass of an element is the weighted average of the relative atomic masses of its various isotopes. The lowest number in the periodic table is the relative atomic mass