钫

概览

Atoms of francium have 87 protons in the nucleus. Its position in period 7, group 1 provides the periodic context for comparing it with neighbouring elements.

Identifiers

原子序数

87

符号

Fr

Also known as

Fr, 钫, 鍅, 钫元素, 鍅元素, 鈁

性质

周期

7

族

1

类别（PubChem）

碱金属

参考文献

1. PubChem Periodic Table: element dataNational Center for Biotechnology Information · PubChem

   Retrieved 2026-09-16. Supplies all 118 atomic numbers, symbols, English names and reference categories. Atomic masses and state predictions are not imported as molecular properties.

2. Periodic Table of ElementsInternational Union of Pure and Applied Chemistry · IUPAC

   the separately displayed lanthanoid and actinoid series.的参考文献 for accepted element names, symbols and periodic placement. Group numbers are omitted

3. IUPAC化学元素周期表（中文版）中国化学会 · Chinese Chemical Society · 2019

   Simplified-Chinese element names and periodic-table positions checked against the January 2019 source.

4. 化學名詞—化學元素一覽表國家教育研究院化學名詞審譯委員會 · National Academy for Educational Research · 2017

   Official 2017 revised list redistributed by 臺南市立將軍國民中學. The attached 20170818化學元素表.doc was downloaded and all 118 number/symbol/name rows checked. Component glyph descriptions are represented by their Unicode characters; documented regional names are retained as search aliases.

5. Accessing the Chemical Elements Data from PubChemSunghwan Kim · IUPAC FAIR Chemistry Cookbook · 2024

   Documents the PubChem element-data service, its 118-row coverage and derivation of periods from atomic numbers.