A+ Pages:2 Words:330
This is just a sample.
To get a unique essay
Hire Writer
Type of paper: Essay
University/College: University of Arkansas System
Subject:
Download: .pdf, .docx, .epub, .txt

A limited time offer!

Get custom essay sample written according to your requirements

Urgent 3h delivery guaranteed

Order Now

Periodic Classification of Elements

Periodic Classification of Elements Classification of Elements according to electron configuration ( type of subshell being filled) *valence electrons –outer electrons of atom which are those involved in chemical bonding ; accounts for similarities in chemical behavior among elemens within each of this groups * Representative elements/ Main Group elements * Group 1A-7A * Incompletely filled s/ p subshells Display a wide range of physical and chemical properties * Most reactive and most predictable 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 energy level H   1s1| Li   2s1| Na   3s1| * Noble Gases * Group 8A * Completely filled p subshell (exc. He) * Great stability * Except krypton and xenon, elements in noble gases are totally inert chemically * The noble gases are all found in minute quantities in the atmosphere, and are isolated by fractional 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 electricity and heat * exhibit several common oxidation states * Less predictable properties * 2B (Zinc, Mercury etc.

We will write a custom essay sample on Periodic Classification of Elements specifically for you
for only $13.90/page
Order Now

)- neither representative elements nor transition metals * Transition metal compounds are paramagnetic when they have one or more unpaired d electrons. Sc 4s23d1| Ti 4s23d2| V 4s23d3| * Inner Transition Metals Lanthanides/rare earth series- Follow lanthanum

Actinides- follow actinium; most of these elements are not found in nature but have been synthesized * Incompletely filled f subshells * Cerium: 1s22s22p63s23p64s23d104p65s24d105p66s24f2 Praseodymium:1s22s22p63s23p64s23d104p65s24d105p66s24f3 Electron Configurations of Cations and Anions Ions derived from Representative Elements Cation- electrons removed Anion- electrons added Isoelectronic – ions or atoms and ions that have the same number of electrons, and hence the same ground state electron configuration Cations derived from transition Metals Prepared By: Monina Te