Historical clue formulations

• B in chemistry class — 2025-04-19
• The Fifth Element — 2021-10-10
• Element that burns with a green flame — 2020-07-03
• Element before carbon on the periodic table — 2019-05-08
• Element in Pyrex — 2015-06-26
• Chemical element — 2015-01-22
• B, to scientists — 2013-12-06
• Element with a low atomic number that is not found naturally on Earth — 2013-06-21
• *Element in the cleanser 20 Mule Team — 2012-08-08
• Element used for shielding nuclear reactors — 2011-12-04
• Group 13 member, in chemistry — 2010-10-30
• Ulexite is rich in it — 2010-03-13
• The fifth element — 2008-10-05
• A metalloid — 2006-11-17
• Element #5 — 2004-10-31
• Element with the symbol B — 2004-10-18
• Element in colemanite — 1997-06-07
• Kernite component — 1996-02-24
• Fifth element — 1995-08-04
• Element #5 — 1994-01-14