Examlex
Sodium is the least electronegative in the group H, S, Cl, and Na.
Pyroclastic Flow
A fast-moving current of hot gas and volcanic materials (such as ash and lava fragments) that flows along the ground after an eruption, capable of causing destruction.
Flow-Banded Obsidian
A type of obsidian characterized by the alignment of mineral grains or layers along the flow direction of the lava.
Viscous Lava
Lava that has a high silica content resulting in a thick, slow-flowing consistency.
Mount St. Helens
Mount St. Helens is an active stratovolcano located in the Cascade Range of the Pacific Northwest, famous for its catastrophic eruption on May 18, 1980.
Q35: SO₃
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Q59: Sulfur belongs to the chalcogen family.
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Q137: The number of valence electrons in magnesium
Q155: The measured value 12.011 can be assumed