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The reason symmetric molecules CH4 and SiH4 have very low boiling temperatures is that they have no dipole moment.
Complained
To express dissatisfaction, discomfort, or annoyance about something.
Cycle
A sequence of events that repeat in a regular pattern.
Standards
Accepted levels of quality or achievement established by authority, custom, or common consent, used as a basis for comparison or compliance.
Punctuation
The marks, such as commas, periods, and question marks, used in writing to separate sentences and their elements and to clarify meaning.
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