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2. Hume-Rothery rules - Wikipedia

   en.wikipedia.org/wiki/Hume-Rothery_rules

   [5] [6] The solute and solvent should have similar electronegativity. [7] Valency factor: two elements should have the same valence. The greater the difference in valence between solute and solvent atoms, the lower the solubility.

3. Valence (chemistry) - Wikipedia

   en.wikipedia.org/wiki/Valence_(chemistry)

   Thus, each sulfur atom is hexavalent or has valence 6, but has oxidation state +5. In the dioxygen molecule O 2, each oxygen atom has 2 valence bonds and so is divalent (valence 2), but has oxidation state 0. In acetylene H−C≡C−H, each carbon atom has 4 valence bonds (1 single bond with hydrogen atom and a triple bond with the other ...

4. Atomicity (chemistry) - Wikipedia

   en.wikipedia.org/wiki/Atomicity_(chemistry)

   Atomicity is the total number of atoms present in a molecule of an element. For example, each molecule of oxygen (O 2) is composed of two oxygen atoms.Therefore, the atomicity of oxygen is 2.

5. Praseodymium (III,IV) oxide - Wikipedia

   en.wikipedia.org/wiki/Praseodymium(III,IV)_Oxide

   Pr 6 O 11 adopts a cubic fluorite crystal structure, measured by XRD, TEM and SEM methods. [3] [5] It can be considered an oxygen deficient form of praseodymium(IV) oxide (PrO 2), with the Pr ions being in a mixed valency state Pr(III) and Pr(IV). [5] This characteristic is what gives the oxide its many useful properties for its catalytic activity.

6. Equivalent weight - Wikipedia

   en.wikipedia.org/wiki/Equivalent_weight

   In chemistry, equivalent weight (also known as gram equivalent [1] or equivalent mass) is the mass of one equivalent, that is the mass of a given substance which will combine with or displace a fixed quantity of another substance.

7. This Christmas, ask for genetic testing. It could save your life.

   www.aol.com/christmas-ask-genetic-testing-could...

   Rose Brystowski, 68, had a choice to make. Others might have found it difficult. She found it easy. Doctors discovered a lump during her sister's mammogram back in 2008 that came back positive for ...

8. Disproportionation - Wikipedia

   en.wikipedia.org/wiki/Disproportionation

   2 S 2 O 2− 4 + H 2 O → S 2 O 2− 3 + 2 HSO − 3. Dithionite also undergoes alkaline hydrolysis to sulfite and sulfide: [13] 3 Na 2 S 2 O 4 + 6 NaOH → 5 Na 2 SO 3 + Na 2 S + 3 H 2 O. Dithionate is prepared on a larger scale by oxidizing a cooled aqueous solution of sulfur dioxide with manganese dioxide: [14] [citation needed] 2 MnO 2 + 3 ...

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