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Elements and Comp

CHEM 111

sub atomic particle protons neutrons electrons
Proton 1+ mass 1.672622x10^-24
neutron 1.674927x10^-24
electron 1- mass 9.109383x10^-27
atomic nucleus small region of high density at the center of the atom
atomic mass unit (u) is defined as 1/(total # of p+ and n)
ion equal number of protons and electrons
cation more protons than electrons
anion more electrons than protons
isotopes same atomic number (Z) but different mass numbers (A)
atomic weight average mass of all naturally occurring isotopes of that element
alkali metals shinny solids that react vigorously with air, water
alkaline earth metals react with water from alkaline solutions and the noble gases
Noble gases are the least reactive elements 8A
Halogens the group 7A
transition metals representive elements and elements in B groups
main group elements elements in group A
Lanthanides and actinides periods 6 and 7
metals and non metals on the left side of the table and non metals on the right
allotropes forms of the same element that differ in their physical and chemical properties
molecular formula a molecular formula contains similar
Empirical formula represents the simplest whole number ratio of elements
structural formula shows the linkage of all the atoms in the molecule
condensed structural formula CH3CH2CH2CH20H List the atoms present in groups to indicate connectivity between the atoms
polyatomic ions are groups of covalently bonded atoms that carry an overall positive or negative charge
Created by: hrfalco



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