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Periodic Table
Who created the Periodic Table?
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Born : 1834
Died : 1907
Nationality : Russian
Occupation : Chemist
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Dmitri Mendeleev brought order to
the chaos of chemistry by asserting
his periodic law, which states that
the elements arrange themselves
according to their atomic number
and their chemical properties.
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Elements are listed horizontally according to their atomic number - number of protons
Periods are the horizontal rows of elements
Halogens - highly reactive,
Elements are listed vertically according to their chemical properties
gases except Br liquid
Groups or Families are arranged vertically
Noble gases – stable,
unreactive odourless gases
The Periodic Table
provides information
on the physical and
chemical properties of
elements
Alkali metals - highly
reactive, soft, low densities
Alkaline earth metals burn in air if heated
(fireworks)
Periodic Table
Atomic Mass - mass of average atom
Atomic Number - number of protons &
electrons of a neutral atom
Ion Charge - electric charge that forms
when an atom gains or loses electrons
Reactivity
The Atomic Challenge
Atomic Number
2-
Ion Charge
Symbol
Name
Atomic Mass
Protons
Atomic number equals the number of ____________
and
Electrons
________________
of an atom.
Protons
Atomic mass equals the total number of ______________
and
Neutrons
_______________.
8
8
8
Number of protons_______electrons
______and neutrons ________.
Atoms of Elements from Periodic Table (Neutral)
Oxygen Atom, O
Zinc Atom, Zn
2-
Lithium, Li
+
2+
Zn
Oxygen
Lithium
8
30
3
16
65
7
8
30
3
8
35
4
8
30
3
Atoms of Elements from Periodic Table
Silicon Atom, Si
Boron Atom, B
Bromine, Br
Br
Si
Boron
14
35
5
28
11
80
14
5
35
14
6
14
5
45
35