Periodic Trends Definitions & Trends
Periodic Trends
Definitions
& Trends
ELECTRONEGTIVITY
Electronegativity is the power of an atom, when in a molecule, to attract electrons to itself.
Electronegtivity Increase across --->Decrease down
ATOMIC RADII
1/2 the distance between the nuclei two like atoms
Different Atomic Radii
Atomic Radii decrease across ------> increase down
IONIC RADII
The radius of an atom after it has gained or lost an electron and becomes an ion
Ionic Radii Increase Across ---->Increase Down
IONIZATION ENERGY
energy necessary to remove an electron from the neutral atom.
Ionization Energy Increase Across ---->Decrease down
ELECTRON AFFINITY
is a measure of the energy change when an electron is added to a neutral atom to form a negative ion.
Electron Affinity Increase Across ---->Decrease Down
Electron Shielding
The effects of the inner electron shell on the outer most electrons
Increase Down Generally decreases across
Atomic Number & Mass
Atomic Number is the number of protons in an element
Atomic mass is the relative average mass of an element
Atomic number & massIncreases across --->Increases down
Melting and Boiling Point
Generally increase across the chart until d orbitals become half filled then Mp and Bp decrease