Periodic trends

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4 Terms

1
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What tells you the amount of valence electrons?

The groups (except helium and transition metals; 3-12)

2
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Electronegativity

Right and up (increases)

3
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Atomic radius

Left and down (increase)

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Factors of atomic radius

# of protons:

  • more = more pull = smaller radius


# of electrons:

  • less = less repulsion = smaller radius

  • more = more repulsion/less pull = more puff = larger radius