AP Chemistry - The Periodic Table

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Corresponds with chapter 2 of Barron's AP Chemistry

Symbol for an element: upper left corner

Mass of an isotope

Symbol for an element: Lower left corner

Atomic number. Equal to the number of protons

Number of electrons in an isotope

Equal to the atomic number, unless the atom is charged

Number of neutrons in an isotope

Mass - atomic number

Isotopes

Same atoms with different number of neutrons, and thusly a different mass

Metallic characteristic trend

Metallic character increases from top to bottom

Allotropes

Multiple forms of an atom (such as graphite, diamond, etc)

Atomic Radius trend

Decreases from left to right and increases from top to bottom.

Ionization energy trend

Decreases from top to bottom and Increases from left to right

Electron affinity

The energy change that accompanies the addition of an electron to an atom

Electron affinity trend

Decrease from left to right and Increase from top to bottom

Electronegativity trend

Increases from left to right and decreases from top to bottom

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