Patterns

Families:

Vertical columns of elements
Periods:

Horizontal rows of elements going across Periodic Table
Neutrons in an atom:

Mass # - Atomic # (number of p⁺) = n⁰
Energy level:
- Circles around nucleus. First holds 2 electrons, then each hold 8. Fill up each one by going around clockwise until there are 8.
Valence Electrons:

Number of electrons on farthest out orbital
Family # = ?

Number of valence electrons
Period # = ?

Number of energy levels
Atomic radius:

Decreases moving left to right in a period, increases moving down a family.
What causes the pattern of atomic radius?

More attraction between electrons (which increase) and protons
Ionization Energy:

Energy required to remove an electron from an atom
Patterns of Ionization Energy

Increases as you move left to right in a period, decreases as you move down a family.

Less pull on electrons
Electronegativity:

Measure of ability of an atom to gain electrons
Patterns of Electronegativity:

Increases as you move left to right on a period, decreases as you move down a family

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Card Set

Patterns

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Updated

2010-10-10T19:51:23Z

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