Coulomb law Electric Fields of Force The Force

Coulomb law

Electric Fields of Force • The Force of Electric charges are determined by the type of charge of the objects. • unlike charges attract • like charges repel • A strong charge will attract a weak or neutral charge

Coulomb’s law • The magnitude of the force between 2 equal sized objects k (electrostatic constant =8. 99 x 10 N m /C ) Fe = k q 1 q 2 q (charge in Coulombs) r ( distance between the charges) 2 r 9 • Fe r 2 2

• • • �Qualitative statement: The force between two charged particles depends on three things: 1) the nature of the signs of the charges: tells you whether the force is attractive or repulsive 2) the magnitudes of the charges: The bigger the magnitudes (strictly speaking, the product of the two magnitudes), the stronger the force. 3) The distance between the centers of the two particles: The larger the distance, the weaker the force.

Coulombs Law: Summary • Fe = k q 1 q 2 r 2 • The force of electrical charge is an inverse square of the distance between the charge:

Periodic Trends • Compare the force of attraction between a valence electron to the core of fluorine vs oxygen • Compare the force of attraction between a valence electron to the core of fluorine vs bromine

• How does this relate to atomic radius, ionization energy, electron affinity, electronegativity, and reactivity?