can someone explain the periodic trend?

O

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atomic radius,ionization energy, electron affinity,

for example i have a lot of question that ask place the elements in increasing __(one of those above)
or which one has the highest atomic radius or what not

ex. Li,K,C,N ,place atoms in order from increasing ionization energy
would it be ??=C,N,Li,K
 
Atomic radius gets smaller as it goes > and bigger as it goes down
Ionization energy gets bigger as it goes > and smaller as it goes down
electron affinity has the same trend as ionization energy

Your example should have N as the largest, followed by C,Li and K
 
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