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C3 1 (The transition elements (High melting points (Except mercury), Good…
C3 1
The transition elements
Good conductors
Hard
Strong
High density
High melting points
Except mercury
Less reactive than group 1
Corrode slowly or not at all
Group 1 - the alkali metals
Volatile in air
Very low density
Lithium, sodium, potassium float
Low melting and boiling points
React with water to form metal hydroxide
React with nonmetals to form metal salts
Group 7 - halogens
Low melting and boiling points
Poor conductors
Covalent bonds
More reactive halogens displace less reactive halogens
Form ions with -1 charge
The modern periodic table
Group 1
Reactivity increases as you descend due to weaker forces of attraction to nucleus
Group 7
Reactivity decreases as you descend due to outer shells shield the positive charge on the nucleus
Group 0
Noble Gases
The early periodic table
Dalton
20 elements
Ordered by mass
1808
Newlands
Law of octaves
Groups of eight
56 elements
Many refused to accept
Ordered by mass
Mendeleev
Father of modern periodic table
Ordered by atomic weight
Left gaps
Groups with free electrons
