• Francium
  Francium

  A radioactive alkali metal with the atomic symbol Fr, and atomic number 87. The mass numbers of known isotopes are 204-213, 217-224. Its valence is +1....<br/>
  MeSH
• Mendelevium
  Mendelevium

  A man-made radioactive element of the actinide family with atomic symbol Md, and atomic number 101.<br/>
  MeSH

Your browsing activity is empty.

Activity recording is turned off.

Turn recording back on