Because of its high reactivity is not found naturally in its elemental state; Sodium metal tarnished readily in air due to the formation of a layer of Sodium Oxide on the surface of the metal.
Helium is a very non reactive gas.
reative age
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The British Isles are a group of islands off the northwest coast of continental Europe
The alkali metals are the most reactive group of metals on the periodic table. This group includes elements such as lithium, sodium, and potassium, which readily lose their outer electron to form ions in chemical reactions.
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Hydrometer? Reative humidity, measured in per-cent. (Percentage of the concentration of water vapor which saturates the local atmosphere).
Unless disturbed by later events, younger layers overlie older layers. See the law of super-position.
Faults are always younger than the rocks they cut. They cannot be older that the rocks they are cutting, because the rocks would not be there.
sodium chlorateNaClO3 = Sodium Chlorate
Sodium fluoride is an ionic compound with the formula NaF.