كيمياء لغات - الباب الثانى | The periodic table | كايرودار التعليمي
للصف الثالث الثانوي
كيمياء لغات - الباب الثانى | The periodic table | كايرودار التعليمي
للصف الثالث الثانوي
كيمياء لغات - الباب الثانى | The periodic table | كايرودار التعليمي
للصف الثالث الثانوي
tableArrangement of elements in an ascending order according to their atomic numbers and it agrees with sequence of building up principle
2P
3P
4P
5P
6P
7P
1S
2S
3S
4S
5S
6S
7S
3d
4d
5d
6d
4f
5f
A- BLOCKS OF THE PERIODIC TABLE
S- Block P- Block d- Block f- Block
It includes the elements whose outer most electrons occupy the s-sublevel
nS1,nS2 It includes the elements whose outer most electrons occupy the p-sub level nP1 to np6 It includes the elements whose outer most electrons occupy the d-sub level It includes the elements whose outer most electrons occupy the f-sub level
It Consists of the groups (1A) and (2A) It Consists of the groups (3A) , (4A) (5A) , (6A) , (7A),
(zero group) It Consists of the groups B which called (main transition elements) It Consists of lanthanides and actinides
[ Inner T.E ]
It’s placed in the left hand side of the table It’s placed in the right hand side of the table It’s placed in the middle of the table It’s placed below the table G.R.F
To reduce the table
B- DESCRIPTION OF PERIODIC TABLE
* It consists of seven ( horizontal ) periods and 18 vertical groups
Period one: - * It consists of two elements, hydrogen and helium.
Period two: - * It consists of eight elements G.R.F
Because: the sublevels 2S2 and 2P6 will be filled succ.
Period three: - * It consists of eight elements G.R.F
Because: the sublevels 3S2 and 3P6 will be filled succ.
Period four: - * It consists of 18 elements G.R.F
Because: the sublevels 4S2, 3d10 and 4P6 will be filled succ.
Period five: - * It consists of 18 elements G.R.F
Because: The sublevels 5S2, 4d10 and 5P6 will be filled succ.
Period six: - * It consists of 32 elements G.R.F
Because: 6S2 ,4F14, 5d10 and 6P6 will be filled succ.
Period :-
*Several elements are arranged horizontally according to their atomic numbers
which increases by one from left to right.
* Each period begins by filling a new energy level and ends by an inert gas.
Elements of the same period similar in number of energy levels but different in atomic number , valency level and chemical properties
Group:-
*Several elements arranged ver
tically and they are similar in valency level and chemical properties but different in the principal quantum number.