__-cone

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Possible Answers: SNO.

Last seen on: –LA Times Crossword 18 Sep 20, Friday
The Washington Post Crossword – Mar 19 2020
LA Times Crossword 19 Mar 20, Thursday
LA Times Crossword 13 Oct 19, Sunday
LA Times Crossword 27 Jul 19, Saturday

Random information on the term “SNO”:

Tin(II) oxide (stannous oxide) is a compound with the formula SnO. It is composed of tin and oxygen where tin has the oxidation state of +2. There are two forms, a stable blue-black form and a metastable red form.

Blue-black SnO can be produced by heating the tin(II) oxide hydrate, SnO·xH2O (x<1) precipitated when a tin(II) salt is reacted with an alkali hydroxide such as NaOH.
Metastable, red SnO can be prepared by gentle heating of the precipitate produced by the action of aqueous ammonia on a tin(II) salt.
SnO may be prepared as a pure substance in the laboratory, by controlled heating of tin(II) oxalate (stannous oxalate) in the absence of air or under a CO2 atmosphere. This method is also applied to the production of ferrous oxide and manganous oxide.

Tin(II) oxide burns in air with a dim green flame to form SnO2.

When heated in an inert atmosphere initially disproportionation occurs giving Sn metal and Sn3O4 which further reacts to give SnO2 and Sn metal.

SNO on Wikipedia