# Bảng khối lượng nguyên tử chuẩn IUPAC (CIAAW) Canonical ID: `intl.tieu-chuan-do-luong.du-lieu-khoa-hoc-tham-chieu.khoi-luong-nguyen-tu-chuan-iupac` Bảng khối lượng nguyên tử chuẩn hiện hành do Ủy ban CIAAW thuộc IUPAC công bố, gồm các nguyên tố từ hydro đến oganesson. Bảng dựa trên báo cáo Atomic Weights 2021 và đã bao gồm các điều chỉnh năm 2024 đối với gadolinium, lutetium và zirconium. **Scope:** Tiêu chuẩn tính toán khối lượng mol, phân tích định lượng hóa học, thương mại hóa chất và địa hóa học quốc tế. ## Highlights - **Số nguyên tố trong bảng:** 118 nguyên tố — Hydro đến oganesson; bảng CIAAW 2024 - **Nguyên tố có khối lượng nguyên tử chuẩn:** 84 nguyên tố — Có giá trị được liệt kê; đếm từ bảng CIAAW 2024 - **Điều chỉnh năm 2024:** 3 nguyên tố — Gadolinium, lutetium, zirconium ## Data | Mã định danh | Mã | Tên / chỉ tiêu | Mã cấp trên | Cấp phân loại | Nhóm | Định nghĩa | Phiên bản | Thời điểm công bố | Địa bàn | URL nguồn | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | 1 | H | hydrogen | | | | Standard atomic weight: [1.007 84, 1.008 11]; note m. | | | | | | 2 | He | helium | | | | Standard atomic weight: 4.002 602(2); notes g, r. | | | | | | 3 | Li | lithium | | | | Standard atomic weight: [6.938, 6.997]; note m. | | | | | | 4 | Be | beryllium | | | | Standard atomic weight: 9.012 1831(5). | | | | | | 5 | B | boron | | | | Standard atomic weight: [10.806, 10.821]; note m. | | | | | | 6 | C | carbon | | | | Standard atomic weight: [12.0096, 12.0116]. | | | | | | 7 | N | nitrogen | | | | Standard atomic weight: [14.006 43, 14.007 28]; note m. | | | | | | 8 | O | oxygen | | | | Standard atomic weight: [15.999 03, 15.999 77]; note m. | | | | | | 9 | F | fluorine | | | | Standard atomic weight: 18.998 403 162(5). | | | | | | 10 | Ne | neon | | | | Standard atomic weight: 20.1797(6); notes g, m. | | | | | | 11 | Na | sodium | | | | Standard atomic weight: 22.989 769 28(2). | | | | | | 12 | Mg | magnesium | | | | Standard atomic weight: [24.304, 24.307]. | | | | | | 13 | Al | aluminium | | | | Standard atomic weight: 26.981 5384(3). | | | | | | 14 | Si | silicon | | | | Standard atomic weight: [28.084, 28.086]. | | | | | | 15 | P | phosphorus | | | | Standard atomic weight: 30.973 761 998(5). | | | | | | 16 | S | sulfur | | | | Standard atomic weight: [32.059, 32.076]. | | | | | | 17 | Cl | chlorine | | | | Standard atomic weight: [35.446, 35.457]; note m. | | | | | | 18 | Ar | argon | | | | Standard atomic weight: [39.792, 39.963]. | | | | | | 19 | K | potassium | | | | Standard atomic weight: 39.0983(1). | | | | | | 20 | Ca | calcium | | | | Standard atomic weight: 40.078(4); note g. | | | | | | 21 | Sc | scandium | | | | Standard atomic weight: 44.955 907(4). | | | | | | 22 | Ti | titanium | | | | Standard atomic weight: 47.867(1). | | | | | | 23 | V | vanadium | | | | Standard atomic weight: 50.9415(1). | | | | | | 24 | Cr | chromium | | | | Standard atomic weight: 51.9961(6). | | | | | | 25 | Mn | manganese | | | | Standard atomic weight: 54.938 043(2). | | | | | | 26 | Fe | iron | | | | Standard atomic weight: 55.845(2). | | | | | | 27 | Co | cobalt | | | | Standard atomic weight: 58.933 194(3). | | | | | | 28 | Ni | nickel | | | | Standard atomic weight: 58.6934(4); note r. | | | | | | 29 | Cu | copper | | | | Standard atomic weight: 63.546(3); note r. | | | | | | 30 | Zn | zinc | | | | Standard atomic weight: 65.38(2); note r. | | | | | | 31 | Ga | gallium | | | | Standard atomic weight: 69.723(1). | | | | | | 32 | Ge | germanium | | | | Standard atomic weight: 72.630(8). | | | | | | 33 | As | arsenic | | | | Standard atomic weight: 74.921 595(6). | | | | | | 34 | Se | selenium | | | | Standard atomic weight: 78.971(8); note r. | | | | | | 35 | Br | bromine | | | | Standard atomic weight: [79.901, 79.907]. | | | | | | 36 | Kr | krypton | | | | Standard atomic weight: 83.798(2); notes g, m. | | | | | | 37 | Rb | rubidium | | | | Standard atomic weight: 85.4678(3); note g. | | | | | | 38 | Sr | strontium | | | | Standard atomic weight: 87.62(1); notes g, r. | | | | | | 39 | Y | yttrium | | | | Standard atomic weight: 88.905 838(2). | | | | | | 40 | Zr | zirconium | | | | Standard atomic weight: 91.222(3); note g. | | | | | | 41 | Nb | niobium | | | | Standard atomic weight: 92.906 37(1). | | | | | | 42 | Mo | molybdenum | | | | Standard atomic weight: 95.95(1); note g. | | | | | | 43 | Tc | technetium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 44 | Ru | ruthenium | | | | Standard atomic weight: 101.07(2); note g. | | | | | | 45 | Rh | rhodium | | | | Standard atomic weight: 102.905 49(2). | | | | | | 46 | Pd | palladium | | | | Standard atomic weight: 106.42(1); note g. | | | | | | 47 | Ag | silver | | | | Standard atomic weight: 107.8682(2); note g. | | | | | | 48 | Cd | cadmium | | | | Standard atomic weight: 112.414(4); note g. | | | | | | 49 | In | indium | | | | Standard atomic weight: 114.818(1). | | | | | | 50 | Sn | tin | | | | Standard atomic weight: 118.710(7); note g. | | | | | | 51 | Sb | antimony | | | | Standard atomic weight: 121.760(1). | | | | | | 52 | Te | tellurium | | | | Standard atomic weight: 127.60(3); note g. | | | | | | 53 | I | iodine | | | | Standard atomic weight: 126.904 47(3). | | | | | | 54 | Xe | xenon | | | | Standard atomic weight: 131.293(6); notes g, m. | | | | | | 55 | Cs | caesium | | | | Standard atomic weight: 132.905 451 96(6). | | | | | | 56 | Ba | barium | | | | Standard atomic weight: 137.327(7). | | | | | | 57 | La | lanthanum | | | | Standard atomic weight: 138.905 47(7); note g. | | | | | | 58 | Ce | cerium | | | | Standard atomic weight: 140.116(1); note g. | | | | | | 59 | Pr | praseodymium | | | | Standard atomic weight: 140.907 66(1). | | | | | | 60 | Nd | neodymium | | | | Standard atomic weight: 144.242(3); note g. | | | | | | 61 | Pm | promethium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 62 | Sm | samarium | | | | Standard atomic weight: 150.36(2); note g. | | | | | | 63 | Eu | europium | | | | Standard atomic weight: 151.964(1); note g. | | | | | | 64 | Gd | gadolinium | | | | Standard atomic weight: 157.249(2); note g. | | | | | | 65 | Tb | terbium | | | | Standard atomic weight: 158.925 354(7). | | | | | | 66 | Dy | dysprosium | | | | Standard atomic weight: 162.500(1); note g. | | | | | | 67 | Ho | holmium | | | | Standard atomic weight: 164.930 329(5). | | | | | | 68 | Er | erbium | | | | Standard atomic weight: 167.259(3); note g. | | | | | | 69 | Tm | thulium | | | | Standard atomic weight: 168.934 219(5). | | | | | | 70 | Yb | ytterbium | | | | Standard atomic weight: 173.045(10); note g. | | | | | | 71 | Lu | lutetium | | | | Standard atomic weight: 174.966 69(5); note g. | | | | | | 72 | Hf | hafnium | | | | Standard atomic weight: 178.486(6); note g. | | | | | | 73 | Ta | tantalum | | | | Standard atomic weight: 180.947 88(2). | | | | | | 74 | W | tungsten | | | | Standard atomic weight: 183.84(1). | | | | | | 75 | Re | rhenium | | | | Standard atomic weight: 186.207(1). | | | | | | 76 | Os | osmium | | | | Standard atomic weight: 190.23(3); note g. | | | | | | 77 | Ir | iridium | | | | Standard atomic weight: 192.217(2). | | | | | | 78 | Pt | platinum | | | | Standard atomic weight: 195.084(9). | | | | | | 79 | Au | gold | | | | Standard atomic weight: 196.966 570(4). | | | | | | 80 | Hg | mercury | | | | Standard atomic weight: 200.592(3). | | | | | | 81 | Tl | thallium | | | | Standard atomic weight: [204.382, 204.385]. | | | | | | 82 | Pb | lead | | | | Standard atomic weight: [206.14, 207.94]. | | | | | | 83 | Bi | bismuth | | | | Standard atomic weight: 208.980 40(1). | | | | | | 84 | Po | polonium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 85 | At | astatine | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 86 | Rn | radon | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 87 | Fr | francium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 88 | Ra | radium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 89 | Ac | actinium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 90 | Th | thorium | | | | Standard atomic weight: 232.0377(4); note g. | | | | | | 91 | Pa | protactinium | | | | Standard atomic weight: 231.035 88(1). | | | | | | 92 | U | uranium | | | | Standard atomic weight: 238.028 91(3); notes g, m. | | | | | | 93 | Np | neptunium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 94 | Pu | plutonium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 95 | Am | americium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 96 | Cm | curium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 97 | Bk | berkelium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 98 | Cf | californium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 99 | Es | einsteinium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 100 | Fm | fermium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 101 | Md | mendelevium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 102 | No | nobelium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 103 | Lr | lawrencium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 104 | Rf | rutherfordium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 105 | Db | dubnium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 106 | Sg | seaborgium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 107 | Bh | bohrium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 108 | Hs | hassium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 109 | Mt | meitnerium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 110 | Ds | darmstadtium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 111 | Rg | roentgenium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 112 | Cn | copernicium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 113 | Nh | nihonium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 114 | Fl | flerovium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 115 | Mc | moscovium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 116 | Lv | livermorium | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 117 | Ts | tennessine | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | | 118 | Og | oganesson | | | | Standard atomic weight: — (no value listed in the CIAAW table). | | | | | ## Freshness - Current version: `Standard Atomic Weights 2024` - Status: current - Effective date: — - Published date: 2026-10-01 - Last verified: 2026-10-01 - Last updated: 2026-10-01 - Update policy: event-driven - Refresh policy: Cập nhật hai năm một lần sau các kỳ họp toàn thể của Ủy ban CIAAW trực thuộc IUPAC. ## Sources - [Standard Atomic Weights 2024](https://www.ciaaw.org/atomic-weights.htm) — Commission on Isotopic Abundances and Atomic Weights (CIAAW), IUPAC; source date: 2024-01-15; retrieved: 2026-09-25; license: Public Domain - [CIAAW Publications – Standard atomic weights of the elements 2021](https://www.ciaaw.org/publications.htm) — Commission on Isotopic Abundances and Atomic Weights (CIAAW), IUPAC; source date: 25/09/2026; retrieved: 2026-09-25; license: Public Domain - [Standard atomic weights of three technology critical elements revised](https://iupac.org/standard-atomic-weights-of-three-technology-critical-elements-revised/) — International Union of Pure and Applied Chemistry (IUPAC); source date: 25/09/2026; retrieved: 2026-09-29; license: Public Domain - [Standard Atomic Weights 2024](https://ciaaw.org/atomic-weights.htm) — CIAAW / IUPAC; source date: —; retrieved: 2026-10-01; license: Public Domain - [Abridged Standard Atomic Weights 2024](https://ciaaw.org/abridged-atomic-weights.htm) — CIAAW / IUPAC; source date: —; retrieved: 2026-10-01; license: Public Domain - [Historical changes of standard atomic weights](https://www.ciaaw.org/historical-atomic-weights.htm) — CIAAW / IUPAC; 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