Historical clue formulations

• Like krypton — 2026-04-12
• Not budging — 2026-01-17
• Like He and Xe — 2025-12-19
• Dormant — 2025-11-15
• Not going anywhere — 2025-09-05
• Unlikely to react — 2025-05-30
• Like noble gases — 2025-05-13
• Like helium — 2025-04-19
• Not chemically reactive — 2024-12-10
• Like argon — 2024-05-08
• Like neon — 2024-03-31
• Not quick to react — 2024-03-28
• Unreactive — 2024-03-11
• Reluctant to join? — 2024-03-09
• Nonreactive, as the noble gases — 2023-10-30
• Unmoving — 2023-06-23
• Like noble gases — 2023-03-12
• Unmoving — 2022-11-26
• Like neon and argon — 2022-08-16
• Still — 2022-06-05
• Like helium — 2022-03-09
• Immobile — 2022-01-27
• Unlikely to give a strong reaction — 2021-10-16
• Like neon — 2021-04-18
• Unmotivated, and then some — 2021-03-13
• Unreactive — 2021-02-25
• Not reacting — 2021-01-06
• Not so moving? — 2020-12-13
• Like the noble gases — 2020-11-22
• Like neon — 2020-07-16
• Unresponsive — 2020-06-20
• Like the gases neon and argon, but not oxygen and hydrogen — 2020-05-04
• Like xenon — 2020-03-13
• Chemically nonreactive — 2019-12-05
• Like argon or neon — 2019-10-28
• Like xenon or neon — 2019-09-22
• Stationary — 2019-05-09
• Like helium — 2019-04-27
• Nonreactive — 2019-03-17
• Like atoms with complete valence shells — 2019-01-03
• Like gases in the rightmost column of the periodic table — 2018-12-19
• Static — 2018-11-18
• Nonreactive — 2017-11-12
• Lifeless — 2017-11-10
• Not moving — 2017-11-08
• Like krypton — 2017-10-11
• Chemically nonreactive — 2017-09-26
• Sluggish — 2017-09-24
• Sluggish — 2017-05-30
• Sluggish — 2017-04-04