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Atomic radii
size of an atom
How does atomic radii increase?
down and to the left
The left has
less protons and weaker nucleus
Ionization energy
energy required to remove an electron from an atom
How does ionization energy decrease?
down and to the left
Down
= bigger atom, weaker nuclear change (ionic energy)
Left
= atoms want to lose the electrons (ionic energy)
How does ionization energy increase?
left to right
Down on the periodic table means
more energy levels
Left on the periodic table
less protons, weak nucleus
How does ionizatiion energy increase?
left to right
Electron difficulty
the energy change when an electron is added
Down (affinity)
bigger atom, weakrr nuclear #
Left (nuclear affinity)
atoms want to lose electrons, not gain
Noble gases have
0 electron affinity
Alkali Metals
most reactive metals
Where are Alkali metals found?
group 1, s1 config
Alkaline-Earth metals
very reactive
Where are Alkaline Earth metals located?
group 2, s2 config
Helium is
NOT an Alkaline-Earth metal
Transition Metals
mostly unreactive metals
Where are transition metals located?
groups 3-12, parts of 13, 14, and 15
Transition Metals have the most
elements (d)
Lanthanides
mostly unreactive,, 4f config
Where are Lanthanides located?
found in the first row of the f block
When do Lanthanides begin?
after La (pd 6)
Actindes
mostly unreactive, but radioactive
Where are Transition metals located?
mostly in groups 3-12, and parts of 13, 14, and 15
Where are Actinides found?
2nd row of f block
What are properties of Actinides?
mostly unreactive, radioactive
What often happens to Actinides?
they're so PHAT they break down
Where do Actinides begin?
after Ac (pd 7)
What configuration do Actinides have?
5f
Metalloids
properties of both metals and nonmetals
Where are metalloids found?
grps 13-16
Halogens
most reactive nonmetals
What are halogens mostly?
gases
Where are Halogens located?
grp 17
What configuration do Halogens have?
p5
Noble Gases
completely unreactive - most stable elements
Where are Noble Gases located?
Group 18, p6 config
look at it
please
How did Mendelev organize the periodic table?
by masses
How did Mosely organize the periodic table?
by number
