Periodic Table
by
Period1Alcazar
Last updated 7 years ago
Discipline:
Science Subject:
Chemistry
Grade:
8


The Periodic Table
.
all atoms want a full outer cloud!
Moseley arranged table again by atomic number (what we use today)
PERIODIC
meaning of
repeating or followinga regular pattern
:
3
classes
l
l
nonmetals
metalloids
metals
groups - vertical columns of the table
symbol
element name
atomic mass
atomic number
periods - horizontal rows of the table
KEY DEFINITIONS
created by Mendeleev (by atomic mass)
valance electrons- electrons in the most outer cloud
groups 1 & 2:reactive metals
group 1: alkali metals-1 valance-reactive-low densitygroup 2: alkaline-earth metals-reactive, less than group 1-2 valance-silver, less dense tan group 1
groups 3-12:transition metals
-all metals-2 valance-less reactive than first 2groups-shiny, good conductors-high densities & melting points
group 13: boron group-3 valance-reactivegroup 14: carbon group-4 valance-reactivity variesgroup 15: nitrogen group-5 valance-reactivity variesgroup 16: oxygen group-6 valance-reactive
groups 13-16:metalloids
group 17: halogens-7 valance-very reactive-when reacting, form saltsgroup 18: noble gases-8 valance-not reactive
groups 17 & 18:nonmetals
Ashley TangPeriod 1
There are no comments for this Glog.