Examlex
When human wants and needs exceed the resources that are available to meet those wants and needs, _____ occurs.
B
In the context of the periodic table, "B" stands for Boron, a chemical element with atomic number 5, known for its ability to form covalent bonds.
Si
The chemical symbol for silicon, a hard, brittle crystalline solid used in semiconductors and as a component of various alloys.
As
A symbol for the chemical element arsenic, which is a metalloid known for its various allotropes and toxicity in many compounds.
Lewis Structures
Illustrations that depict how atoms within a molecule bond together and also visualize any unpaired electrons that might be present.
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