Thursday, December 13, 2018
'Periodic Classification of Elements\r'
'Periodic Classification of Elements Classification of Elements concord to electron configuration ( type of subshell being filled) * valence electrons Ã¢â¬outer electrons of atom which ar those involved in chemical bonding ; accounts for similarities in chemical way among elemens within each of this groups * Representative elements/ Main root elements * base 1A-7A * Incompletely filled s/ p subshells Display a wide range of somatogenic and chemical properties * Most reactive and most certain with respect to periodic properties * most abundant elements on the earth, in the solar system, and in the universe * Group number equals the number of electrons in the highest / outermost cipher level HÃÂ ÃÂ ÃÂ 1s1| LiÃÂ ÃÂ ÃÂ 2s1| NaÃÂ ÃÂ ÃÂ 3s1| * statuesque Gases * Group 8A * Completely filled p subshell (exc. He) * swell stability * Except krypton and xenon, elements in master gases argon totally inert chemically * The courtly gases are all found in comminuted quantitie s in the atmosphere, and are isolated by aliquot distillation of liquid air. helium| 1s2| neon| [He]2s22p6| argon| [Ne]3s23p6| * Transition Metals * Group 1B and 3B-8B * Incompletely filled d subshells * Readily produce cations * ductile and malleable, and conduct electrical energy and heat * exhibit several common oxidization states * Less predictable properties * 2B (Zinc, Mercury etc. )- incomplete representative elements nor intonation metals * Transition metal compounds areÃÂ paramagneticÃÂ when they have one or more(prenominal) unpairedÃÂ dÃÂ electrons. Sc 4s23d1| Ti 4s23d2| V 4s23d3| * Inner Transition Metals Lanthanides/rare earth series- deliver the goods lanthanum\r\nActinides- follow actinium; most of these elements are not found in nature barely have been synthesized * Incompletely filled f subshells * atomic number 58: 1s22s22p63s23p64s23d104p65s24d105p66s24f2 Praseodymium:1s22s22p63s23p64s23d104p65s24d105p66s24f3 Electron Configurations of Cations and Anions Ions derived from Representative Elements Cation- electrons removed Anion- electrons added Isoelectronic Ã¢â¬ ions or atoms and ions that have the similar number of electrons, and hence the same ground state electron configuration Cations derived from transition Metals Prepared By: Monina Te\r\n'