Noble gas

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Possible Answers:

XENON.

Last seen on: –Eugene Sheffer – King Feature Syndicate Crossword – Aug 5 2022
Thomas Joseph – King Feature Syndicate Crossword – Apr 6 2022
LA Times Crossword 23 Oct 21, Saturday
Thomas Joseph – King Feature Syndicate Crossword – Nov 11 2020
Thomas Joseph – King Feature Syndicate Crossword – Oct 16 2020
LA Times Crossword 18 Feb 20, Tuesday

Random information on the term “Noble gas”:

This page provides supplementary data about the noble gases, which were excluded from the main article to conserve space and preserve focus. Oganesson mostly not included due to the amount of research known about it.

Radon is available only in very small quantities, and due to its short half-life, is generally produced by a radium-226 source in secular equilibrium.[22]

Noble gas on Wikipedia

Random information on the term “XENON”:

In astronomy and cosmology, baryonic dark matter is dark matter composed of baryons. Only a small proportion of the dark matter in the universe is likely to be baryonic.

As “dark matter”, baryonic dark matter is undetectable by its emitted radiation, but its presence can be inferred from gravitational effects on visible matter. This form of dark matter is composed of “baryons”, heavy subatomic particles such as protons and neutrons and combinations of these, including non-emitting ordinary atoms.

Baryonic dark matter may occur in non-luminous gas or in Massive Astrophysical Compact Halo Objects (MACHOs) – condensed objects such as black holes, neutron stars, white dwarfs, very faint stars, or non-luminous objects like planets and brown dwarfs.

The total amount of baryonic dark matter can be inferred from models of Big Bang nucleosynthesis, and observations of the cosmic microwave background. Both indicate that the amount of baryonic dark matter is much smaller than the total amount of dark matter.

XENON on Wikipedia