If the plum pudding model was correct,
all of the alpha particles would have passed straight through the foil with little or no deflection
. Alpha particles were known to be much, much more dense than gold.
What if the plum pudding model of the atom was correct?
If the plum pudding model had been correct then all of the fast,
highly charged alpha particles would have whizzed straight through undeflected
. The scientists were very surprised when other things happened: … a small number of alpha particles were deflected by large angles (> 4°) as they passed through the foil.
What if the Thomson model was correct?
J.J. … Rutherford reasoned that if Thomson’s model was correct then
the mass of the atom was spread out throughout the atom
. Then, if he shot high velocity alpha particles (helium nuclei) at an atom then there would be very little to deflect the alpha particles.
Why the plum pudding model was deemed incorrect?
In 1908, Thomson’s former student, Rutherford, proposed that the plum pudding model was incorrect,
because each atom contained a central nucleus
. … This implied that they bounced off something solid, which Rutherford thought was a central nucleus.
Was the plum pudding model correct?
Thomson’s so-called “plum pudding model”
of the atom was incorrect
. Rutherford’s new model for the atom, based on the experimental results, contained the new features of a relatively high central charge concentrated into a very small volume in comparison to the rest of the atom.
What is the difference between electrons protons and neutrons?
Electrons are a type of subatomic particle with a negative charge. Protons are a type of subatomic particle with a positive charge. Protons are bound together in an atom’s nucleus as a result of the strong nuclear force. Neutrons are a type of subatomic particle with no
charge
(they are neutral).
What was Rutherford’s model called?
Rutherford model, also called
Rutherford atomic model, nuclear atom, or planetary model of the atom
, description of the structure of atoms proposed (1911) by the New Zealand-born physicist Ernest Rutherford.
Is Rutherford’s model correct?
‘ It was eventually discovered that this model does not accurately represent the behavior of electrons or the sizes of particles. The Rutherford model is one of the most popular models of the atom even though it
was only considered accurate from 1909 to 1913
.
What did Rutherford’s model have that Thomsons didn t?
What did Rutherford’s model of the atom include that Thomson’s model did not have?
Oppositely charged objects attract each other
. … However, Ernest Rutherford’s model of the atom failed to explain why electrons were not pulled into the atomic nucleus by this attraction.
Why is the plum pudding model important?
Though defunct by modern standards, the Plum Pudding Model represents an
important step in the development of atomic theory
. Not only did it incorporate new discoveries, such as the existence of the electron, it also introduced the notion of the atom as a non-inert, divisible mass.
Who rejected the plum pudding model?
The Japanese physicist Hantaro Nagaoka
rejected Thomson’s model. He suggested that the atom had a massive nucleus.
Why was Thomson’s model wrong?
Thomson’s atomic model
failed to explain how the positive charge holds on the electrons inside the atom
. It also failed to explain an atom’s stability. The theory did not mention anything about the nucleus of an atom. It was unable to explain the scattering experiment of Rutherford.
What does the plum pudding model state?
The ‘plum pudding’ model of the atom was proposed by JJ Thomson, who had also discovered the electron. … According to this model, the atom is
a sphere of positive charge
, and negatively charged electrons are embedded in it to balance the total positive charge. The electrons are like plums in a pudding.
Why was Rutherford’s model wrong?
The main problem with Rutherford’s model was that
he couldn’t explain why negatively charged electrons remain in orbit when they should instantly fall into the positively charged nucleus
. This problem would be solved by Niels Bohr in 1913 (discussed in Chapter 10).
How does the plum pudding model work?
The plum pudding model (also known as Thomson’s plum pudding model) is a historical scientific models of the atom. The plum pudding model is defined by
electrons surrounded by a volume of positive charge
, like negatively-charged “plums” embedded in a positively-charged “pudding” (hence the name).
Who discovered the electron?
Although
J.J. Thomson
is credited with the discovery of the electron on the basis of his experiments with cathode rays in 1897, various physicists, including William Crookes, Arthur Schuster, Philipp Lenard, and others, who had also conducted cathode ray experiments claimed that they deserved the credit.
