Periodic Classification of Elements

Periodic Classification of Elements Classification of Elements according to electron compliance ( type of subshell being alter) *valence electrons outer electrons of atom which are those knotted in chemical bonding accounts for similarities in chemical behavior among elemens at bottom each of this groups * Representative elements/ Main Group elements * Group 1A-7A * Incompletely modify s/ p subshells Display a wide range of somatogenetic and chemical properties * Most reactive and most predictable with respect to half-yearly properties * most abundant elements on the earth, in the solar system, and in the humans * Group number equals the number of electrons in the highest / outermost energy take H1s1 Li2s1 Na3s1 * Noble Gases * Group 8A * Completely filled p subshell (exc. He) * Great stability * Except krypton and xenon, elements in overlord gases are tot anyy inert chemically * The noble gases are all found in minute quantities in the atmosphere, and are isolated by frac tional distillation of liquid air. helium 1s2 neon He2s22p6 argon Ne3s23p6 * diversity Metals * Group 1B and 3B-8B * Incompletely filled d subshells * Readily produce cations * fictile and malleable, and conduct electricity and heat * exhibit several common oxidation states * Less predictable properties * 2B (Zinc, Mercury etc. )- neither representative elements nor variation metals * Transition metal compounds areparamagneticwhen they have one or more unpaireddelectrons. Sc 4s23d1 Ti 4s23d2 V 4s23d3 * home(a) Transition Metals Lanthanides/rare earth series- Follow lanthanumActinides- follow alternating current most of these elements are not found in nature notwithstanding have been synthesized * Incompletely filled f subshells * Cerium 1s22s22p63s23p64s23d104p65s24d105p66s24f2 Praseodymium1s22s22p63s23p64s23d104p65s24d105p66s24f3 negatron Configurations of Cations and Anions Ions derived from Representative Elements Cation- electrons removed Anion- electrons added Isoelectro nic ions or atoms and ions that have the same number of electrons, and indeed the same ground state electron configuration Cations derived from transition Metals alert By Monina Te