Periodic Trends Flashcards
What is atomic radius
Size of an atom from the center to valence shell of an atom
What is the trend for atomic radius
- Increases down PT
- Decreases across PT
What is ionic radius
The size of an ion from center to valance shell
What is the trend for ionic radius
Cations (+) decrease radius
Anions (-) increase radius
What is ionization energy
Energy needed to remove an electron
What is the trend for ionization energy
Decreases down periodic table
Increases left to right
What is electon afifnity
Energy released when an electron is added in a gasous state
What is the trend for electron affinity
Decreases down periodic table
Increases left to right
What is electronegitivity
The ability of atoms to pull on an electron
What is the trend for electronegitivity
0.0 = Pure covalent bond
0.0 - 0.4 = Non-polar covalent
0.4 - 1.7 = Polar covalent
1.7 - 3.3 = Ionic
What is reactivity
How likely an atom is to react with other substances
What is the reactivity trends of metals
Increases down periodic table
Decreases across periodic table
What is the recativity trends of nonmetals
Decreases down periodic table
Increases across periodic table
What is the shielding effect
- Sheilding of outer electrons by inner electrons
- Prevens outer electrons from feeling effective nuclear charge
