Tham khảo Số_nguyên_tử

  1. 1 2 The Periodic Table of Elements, American Institute of Physics
  2. ↑ The Development of the Periodic Table, Royal Society of Chemistry
  3. ↑ Ordering the Elements in the Periodic Table, Royal Chemical Society
  4. ↑ Moseley, H.G.J. (1913). “XCIII.The high-frequency spectra of the elements”. Philosophical Magazine. Series 6 26 (156): 1024. doi:10.1080/14786441308635052. Bản gốc lưu trữ ngày 22 tháng 1 năm 2010. 
  5. ↑ Eric Scerri, A tale of seven elements, (Oxford University Press 2013) ISBN 978-0-19-539131-2, p.47
  6. ↑ Scerri chaps. 3–9 (one chapter per element)
  7. ↑ Ernest Rutherford | NZHistory.net.nz, New Zealand history online. Nzhistory.net.nz (19 October 1937). Retrieved on 2011-01-26.