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• Metal
  *Group I ([[alkali metal]]s): [[lithium]] (Li), [[sodium]] (Na), [[potassium]] (K) *Group II ([[alkaline earth metal]]s): [[beryllium]] (Be), [[magnesium]] (Mg), [[c
  5 KB (606 words) - 20:28, 11 October 2022
• Lead(II) sulfide
  *[https://www.sciencemadness.org/whisper/viewthread.php?tid=24036 Platinum Group Metal extraction from Galena ore]
  4 KB (491 words) - 09:35, 12 December 2021
• Aromatic compound
  ...benzene ring", after the simple aromatic compound [[benzene]], or a phenyl group when part of a larger compound. ...gs. This is usually done with elemental [[hydrogenation]] using a platinum group metal catalyst at high pressure.
  4 KB (574 words) - 14:58, 2 January 2022
• Period
  ...periodic law. For example, the [[halogen]]s lie in the second-last column (group 17) and share similar properties, such as high reactivity and the tendency ...s and gains an electron, and so behaves chemically as both a group 1 and a group 17 element.
  5 KB (730 words) - 13:40, 9 January 2022
• Group
  ...ock]] columns (between groups 2 and 3) are not numbered. The elements in a group have similar physical or chemical characteristics of the outermost electron The modern periodic table uses the numbering system of "group 1" to "group 18". The system of eighteen groups is generally accepted by the chemistry c
  1 KB (207 words) - 19:18, 6 September 2022