Summary Periodic table; periods, groups and trends

PERIODIC TABLE

•

Group 1 and 2 are s
-

block , as
in

their highest energy electron is 8
in orbital s
-




an s -




d- block
Iv
•
Transition elements are
>
number of electrons increases left →
right ,
groups
and d orbital gradually fills .




•

Groups 3 -8 are p block
-

as their
highest energy electron is in

a p orbital
-
.




PROPERTIES
elements in the same block will have similar
physical properties .




valence electrons determine chemical properties and reactivity
•
.




PERIODICITY