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In how many different ways, can four students, Jim, Paul, Justin, and Bill, be seated in four chairs for a group discussion? => 22 or 24 or 16 or 20..

Physical Characteristics of Group 17 Elements - The important physical properties of group 17 elements are given in table. These are discussed bel..

Physical Characteristics of Group 13 Elements - The important physical constants of group 13 elements arc given in table and their physical characteristics are discussed bel..

Physical Characteristics Group 16 Elements - The important physical properties of the elements of group 16 are recorded as shown below: Some physical properties of the elements of group 16 Property Oxygen Sulphur Selenium Tellurium Polonium Atomic radius (A o ) 0.73 1...

1 (k.J mol -1 ) 1086 756 761 708 715 IE 2 2352 1577 1537 1411 1450 IE 3 4620 3228 3300 2942 3081 IE 4 6220 4354 4409 3929 4082 Electro negativity 2.5 1.8 1.8 1.8 1.9 Melting point (K) 4373 1693 1218 505 600 Boil..

Unlike boron, the other members of the group are metallic and the electropositive character increases as we go down the group. All these elements in their compounds exhibit the oxidation state of + 3 and +1. The important chemical properties of the boron family are discusse..

Group 15 of the Periodic table includes five elements namely nitrogen (N), phosphorus (P), arsenic (As) antimony (Sb) and bismuth (Bi). This group is regarded as nitrogen family. There is a transition from non-metallic to metallic character as we go down the group..

1 (k.J mo1 -1 ) 1402 1012 947 834 703 IE 2 2856 1903 1798 1594 1610 IE 3 4577 2910 2736 2443 2446 Electronegativity 30 2.1 2.0 1.9 1.9 Melting point (K) 63 317.1 1089 904 544.4 Boiling point (K) 77 553.5 888 1860 183..

Amines may be regarded as the alkyl or aryl derivatives of ammonia. They are obtained by the replacements of one or more hydrogen atoms of ammonia by alkyl or aryl groups. They can be classified into primary, secondary or tertiary amines depending upon whether two or three..

Amides - Acid amides may be regarded as the derivatives of carboxylic acids in which -OH part of the carboxylic group is replaced by the -NH 2 group. Esters are derivatives of the carboxylic acids in which the -OH part of the carboxylic group has been replace..