Examlex
Distinguish between the terms "greenhouse effect" and "enhanced greenhouse effect". Include identification of four major greenhouse gases and their sources in your discussion.
Octet Rule
A chemical rule of thumb that states atoms tend to combine in such a way that they each have eight electrons in their valence shells, giving them the same electron configuration as a noble gas.
Lewis Dot Structure
A diagrammatic method for representing an atom's valence electrons and the chemical bonds between atoms within a molecule.
Helium (He)
A colorless, odorless, tasteless, non-toxic, inert monatomic gas with the atomic number 2, making it the second lightest and second most abundant element in the observable universe.
Lewis Dot Structure
A representation of the valence electrons around atoms, indicating bonds and lone pairs in molecules.
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