What is a trajectory? What kind of information do you need to predict the trajectory of a particle?
3.10 The Sizes of Atoms (in pm) Shielding • In a many-electronatom, electronsare both attractedto the nucleus and repelledby other electrons. • The cancellingof the nuclear attractiveforceon an electron due to the electron-electron repulsion is calledshielding. Core electrons are the most effectiveat shielding. Effective Nuclear Charge The effective nuclear charge, Z ,eff the net attraction of an electron to a nucleus after screening. Z eff≈ Z – core electrons • Z effincreases from left to right across a row in the periodic table. • Z effreases slightly as you move down a column. Periodic Trends in Properties of Elements Atomic Radius r = ½ d …decreases from left to