Who is given the modern periodic table? A more detailed classification of the elements is the one devised by Dmitri Mendeleev in 1869; this scheme is familiar to every chemist as the periodic table. Mendeleev arranged the known elements in order of increasing atomic weight (molar mass). This arrangement resulted in families of elements with …
What is s block elements Notes Class 11? The S block elements is a chapter of chemistry in Class 11 of NCERT books. The chapter highlights the elements of the first two groups of the periodic table, which are collectively known as the s block elements. What elements are in S block? The elements in …
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Beryllium, the first member of the Group 2 metals, shows anomalous behaviour as compared to magnesium and rest of the members of the group. Further, it shows a diagonal relationship to aluminium. Before going into the topic we must know what is diagonal relationship.? The answer to this question is quite simple. The similarity in …
All molecules can be described in terms of their symmetry, even if it is only to say they have none. Molecules or any other objects may contain symmetry elements such as mirror planes, axes of rotation, and inversion centres. The actual reflection, rotation, or inversion are called symmetry operations. To contain a given symmetry element, …
What is hydrogenation of alkenes? Key points: Wilkinson’s catalyst, [RhCl(PPh3)3], and related complexes are used for the hydrogenation of a wide variety of alkenes at pressures of hydrogen close to 1 atm or less; suitable chiral ligands can lead to enantioselective hydrogenations. The addition of hydrogen to an alkene to form an alkane is favoured thermodynamically …
The 18-electron rule is sometimes referred to as the effective atomic number or EAN rule. What is EAN rule with example? The sum of the electrons on the metal plus the electrons donated from the ligands was called the effective atomic number (EAN), and when it was equal to 36 (Kr), 54 (Xe) and 86 …
Key points: Tin and lead form tetravalent organo compounds; organotin compounds are used as fungicides and pesticides. Many organometallic compounds of Group 14 are of great commercial importance, although the use of lead is illegal in many parts of the world, owing to its toxicity. Generally, organometallic compounds of the group are tetravalent and have …
