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Selenium (Se) is # 34 on the Periodic Table of Elements. Elemental selenium is a nonmetal that varies in its appearance, from gray to red to black. Native selenium does occur, rarely, as a mineral.
Thirty-five isotopes of selenium are known - seven occur naturally. About 50% of Se is selenium-80. About 24% is selenium-78. Selenium 74, selenium-76, selenium-77, and selenium-82 occur in minor to small amounts. Selenium-79 is radioactive and occurs in trace amounts only.
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Info. at:
en.wikipedia.org/wiki/Selenium
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en.wikipedia.org/wiki/Isotopes_of_selenium
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Photo from the 2025 PIA Queensland Conference in Toowoomba. Photo by Element Photo and Video Productions.
Silicon (Si) is # 14 on the Periodic Table of Elements. It forms by late-stage nuclear fusion in certain types of stars. Elemental silicon is a silvery-gray semi-metal. It is the # 2 most common element in Earth's crust (oxygen is # 1) and is abundant in many minerals (e.g., quartz) and rocks (e.g., granite). The most common silicon-bearing mineral is quartz, SiO2. Quartz and all other silicate minerals have the same fundamental atomic structure - the silica tetrahedron, which consists of one small silicon atoms surrounded by four large oxygen atoms in the shape of a triangle-base pyramid.
Twenty-three isotopes of silicon are known - five of them occur naturally. Silicon-28 is the most common. Silicon-29 and silicon-30 occur in small amounts. Silicon-31 and silicon-32 are unstable, radioactive isotopes that occur in trace amounts only.
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Info. at:
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en.wikipedia.org/wiki/Isotopes_of_silicon
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Purchased paint day before level 4 and had to wait for level 3 to obtain additional paint to finish. A well utilised lockdown