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Elements and Comp
CHEM 111
Question | Answer |
---|---|
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 |