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an alkaline earth metal
Alkaline earth metals are located in Group 2 of the periodic table.
an alkali metal
Alkali metals are very reactive chemically.
main, principal
This is our main goal.
centrality
He played a central role in the project.
(geology) crust
Earthquakes are caused by the movement of the crust.
ingredient / (mathematics) entity
What are the ingredients of this product?
one thing
He ate one apple.
(chemistry) alkali (class of caustic bases)
In this chemical reaction, alkali is needed.
metal
This metal is very hard.
earth, soil, mud / the ground
This earth is fertile, and crops grow well.
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