Thomson model

The first observation made with this apparatus was that apparently all the alpha particles passed through the foil undeflected. Let us see if this result is consistent with the model of the atom proposed by Thomson. You will recall that Thomson s picture of the atom assumed that the positive charge is distributed evenly throughout the entire volume of the atom with the negative electrons embedded in il. Since the electrons weigh so little, the positive part accounts for nearly all of the mass of the atom. Thus the Thomson model pictures the atom as a body of uniform density. 

Thermal equilibrium, 56 Thermite reaction, 122 Thermometers, 56 Thiosulfate ion, 362 Third-row elements, 101 compounds, 102 physical properties, 102 properties, table, 101 Third row of the periodic table, 364 Thomson, J. J., 244 Thomson model of atom, 244 Thorium... 

If the Thomson model of the atom were correct, any a-particles passing through the foil would have been deflected by very small angles. Quite unexpectedly, nearly all of the a-particles passed through the foil with little or no deflection. A few, however, were... 

In Thomson model all the a particles behave in the same way. In Rutherford s model they behave in different ways. 

When Rutherford s coworkers bombarded gold foil with a particles, they obtained results that overturned the existing (Thomson) model of the atom. Explain. 

Describe how the Rutherford a-particle scattering experiment (a) overturned the Thomson model of the atom and (b) led to a conflict with the predictions of classical physics. 

Theoreticnegative charges), B— the Rutherford model (a positive nucleus surroimded by electrons), C—the Bohr model (stating that electrons follow defined orbits around a nucleus), [Pg.14]

Thomson model of the atom. In this early model of the atom, negative particles (electrons) were thought to be embedded In a positively charged sphere. It Is sometimes called the plum pudding model. 

In the Thomson model of the atom, the electrons are negatively charged particles embedded in the positively charged atomic sphere (see Figure 5.4). A neutral atom could become an ion by gaining or losing electrons. 

Rutherford gold foil experiment modified the Thomson model to a nuclear model of the atom ... 

Thomson model of the atom Thomson asserted that atoms are not indivisible but are composed of smaller parts they contain both positively and negatively charged particles—protons as well as electrons. [5.6] titration The process of measuring the volume of one... 

---