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  2. List of chemistry mnemonics - Wikipedia

    en.wikipedia.org/wiki/List_of_chemistry_mnemonics

    The four most common elements in living organisms – carbon, hydrogen, oxygen, and nitrogen – may be remembered with the acronym CHON. To remember the elements necessary for agriculture; C arbon, H ydrogen, Ca lcium, Iron (Fe), Magnesium (Mg), Manganese (Mn), Copper (Cu), Mo lybdenum, Chlorine (Cl), B oron.

  3. Octet rule - Wikipedia

    en.wikipedia.org/wiki/Octet_rule

    The octet rule is a chemical rule of thumb that reflects the theory that main-group elements tend to bond in such a way that each atom has eight electrons in its valence shell, giving it the same electronic configuration as a noble gas. The rule is especially applicable to carbon, nitrogen, oxygen, and the halogens; although more generally the ...

  4. Note-taking - Wikipedia

    en.wikipedia.org/wiki/Note-taking

    Note-taking (sometimes written as notetaking or note taking) is the practice of recording information from different sources and platforms. By taking notes, the writer records the essence of the information, freeing their mind from having to recall everything. [1] Notes are commonly drawn from a transient source, such as an oral discussion at a ...

  5. IUPAC numerical multiplier - Wikipedia

    en.wikipedia.org/wiki/IUPAC_numerical_multiplier

    The numbers 200-900 would be confused easily with 22 to 29 if they were used in chemistry. khīlioi = 1000, diskhīlioi = 2000, triskhīlioi = 3000, etc. 13 to 19 are formed by starting with the Greek word for the number of ones, followed by και (the Greek word for 'and'), followed by δέκα (the Greek word for 'ten').

  6. Study skills - Wikipedia

    en.wikipedia.org/wiki/Study_skills

    Study skills or study strategies are approaches applied to learning. Study skills are an array of skills which tackle the process of organizing and taking in new information, retaining information, or dealing with assessments. They are discrete techniques that can be learned, usually in a short time, and applied to all or most fields of study.

  7. 52 Incredibly Cool Things That Are Free Online That Everyone ...

    www.aol.com/52-helpful-things-free-everyone...

    Image credits: agentp2319 #5. I built [qrfa.st](https://qrfa.st) which offers free qr codes. I built it because I heard horror stories about people making qr codes, only to find out later they had ...

  8. Cornell Notes - Wikipedia

    en.wikipedia.org/wiki/Cornell_Notes

    The Cornell method provides a systematic format for condensing and organizing notes. This system of taking notes is designed for use by a high school or college level student. There are several ways of taking notes, but one of the most common is the "two-column" notes style. The student divides the paper into two columns: the note-taking column ...

  9. Coordination number - Wikipedia

    en.wikipedia.org/wiki/Coordination_number

    Coordination number. In chemistry, crystallography, and materials science, the coordination number, also called ligancy, of a central atom in a molecule or crystal is the number of atoms, molecules or ions bonded to it. The ion/molecule/atom surrounding the central ion/molecule/atom is called a ligand. This number is determined somewhat ...

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