History of atomic structure
Jessie & Aidan
8/21/2016 06:10:58 pm
1. The plum pudding model suggests that the atom was a positively charge with negatively charged electrons floating in it to balance the charge. Rutherfold disproved this model through the gold foil experiment. Most of the particles travelled straight through the gold foil, some deflected at a very small angle which was predicted. However, some particles deflected at a larger angle, with few even bouncing back. This shows that the positive change within the gold atom is concentrated into a small area and the rest of the atom is mostly empty space
8/23/2016 11:40:16 pm
good and easy explanation! Thanks!
8/21/2016 06:11:39 pm
Thomson's 'plum pudding' model suggested that all the electrons are randomly distribute within an atom. Rutherford disproved this method by using the gold foil experiment, through shooting alpha particles and observing their activity. Rutherford predicted that all the particles will go straight through the gold foil. However, the results show that a few particles were deflected at large angles, which suggests that there is something positive which is concentrated in the center of the atom, which later became known as the nucleus. :)
8/22/2016 03:53:26 am
i think this is very easily explained thanks
Eunice + Stephanie
8/21/2016 06:13:54 pm
1. The Plum Pudding model was a positive ball with many electrons bobbing around inside. Rutherford disproved this model with his experiment as some of the positive alpha particles were deflected off the gold foil instead of all passing through cleanly, showing that instead of a big mass of positive stuffing, most of the atom is empty space as it allowed particles to pass through, and most of its mass is concentrated in the middle as well as being positive as like charges repel, causing the deflection.
8/22/2016 01:20:16 am
Did the plum pudding model also indicate that electrons are distributed randomly inside the atom?
8/23/2016 11:42:40 pm
8/21/2016 06:15:31 pm
1.The plum pudding model is a atom where there are many negatively electrons within a larger positively charged electron. Through the Golden Foil Experiment Rutherford proved this theory wrong where not all of the particles passed through the atom. And he concluded that there is a positively charged electron in the centre.
Dom and Kwun Hei
8/21/2016 06:15:40 pm
1. The plum pudding model puts forth the idea that the atom is a sphere of positivley charged energy and that the negatively charged electrons are embedded in it like the plums in pudding to balance out the resultant charge. However, Rutherford disproved the plum pudding model with his gold foil experiment which showed that even though some particles passed straight through, some particles were reflected at large angles as well as deflected almost straight back which showed that there is a nucleus in the middle consisting of protons and neutrons unlike the plum pudding model.
8/22/2016 03:28:49 am
I like that you guys explained the plum pudding model to the analogy of a plum pudding, hence its name. I also agree with your comment about how there must be a concentrated mass of positive charge in the middle if some particles bounced back as like charges repel
Jesse and Aidan
8/21/2016 06:15:46 pm
Rutherford prediction before conducting the gold foil experiment was that most alpha particles would travel straight through the gold foil although when he carried out his experiment the results did not support his hypothesis. Many particles were reflected at large angles and some were even reflected straight back. This proved that the positive charge of the atoms of gold were concentrated in a small area and that was causing some particles to deflect. This proved that there was a nucleus in the gold atoms.
8/24/2016 06:24:46 am
Well explained. Thank you
Sopia and Michelle
8/21/2016 06:15:56 pm
What is the "plum pudding" model of an atom and how did Rutherford disproof this model
8/24/2016 06:17:34 am
Does the sample in Rutherford's experiment have to have a specific type of radiation (eg alpha radiation) for it to work?
9/16/2020 10:42:44 pm
History of Atomic Chemistry
9/16/2020 10:49:06 pm
Thomson’s ‘plum pudding’ model describes that the atomic structure is like a ball of positive charge with electrons moving randomly within it. This, however, was disproved in 1909 by Earnest Rutherford. He did an experiment where he shot lots of positively charged alpha particles at a thin sheet of gold foil, with a sheet of zinc sulfide surrounding the foil. He expected the particles to just go through the foil. But the results showed that some particles were deflected at wide angles and sometimes even straight backwards. However, most particles just passed straight through. From this, Rutherford concluded that most of the atom is empty space and that the positive charge of the atom is concentrated in the middle, which is the nucleus.
9/16/2020 10:51:45 pm
Thomas's Plum Pudding model suggested that an atom consist of electrons that randomly move inside a positive matrix. Rutherford disproved this theory through his Gold Foil experiment in which he found that atoms have a position nucleus.
9/16/2020 10:52:11 pm
A plum pudding model is a historical scientific model of an atom that demonstrates itself to have electrons embedded in a volume of positive charge. Rutherford disproved Thompson by conducting a gold foil experiment. When Rutherford shot alpha particles through the foil, most particles went through but some scattered and were reflected back to its source, due to the positively charged nucleus.
9/16/2020 10:55:17 pm
9/16/2020 10:56:06 pm
J.J.Thomson's plum pudding model shows the atom as composed of electrons scattered through out a spherical cloud of positive charge. This model was disproved by Ernest Rutherford's experiment. HE fired positively charged alpha particles at a thin sheet of gold foil. There were some deflected at large angles though most passed through with little deflections. Hence, this experiment showed that the atom was mostly empty space with the positive charge concentrated in the centre(nucleus). Rutherford predicted that all the alpha particles would pass through the foil cleanly. It was mostly supported as only few of them were deflected
9/16/2020 10:57:23 pm
The plum pudding model was proposed by Thomson to explicate the structure of an atom. He stated that the atom was a positive matrix with negatively charged electrons floating in the middle to balance the charge. Rutherford disproved this by performing the Gold Foil Experiment, where he shot alpha particles at a sheet and noticed that while the majority passed through, some were reflected off. This implied that the positively charged area of the atom (nucleus) was small and clustered.
1. The plum pudding model was constructed by J.J. Thompson, it shows that the atom had an overall neutral charge with negatively charged electrons being distributed randomly in a positively charged matrix or body of the atom.
9/16/2020 10:58:36 pm
1. The plum pudding model of the atom was devised by J.J Thompson where he concluded that the rays of a cathode ray were actually negatively charged particles (corpuscles/electrons). He said an atom is therefore a positively charged matrix with a random arrangement of electrons. The matrix being the pudding and the electrons being the bits of fruit.
9/16/2020 10:58:44 pm
Thomson's plum pudding model say the atom look like a ball with positive charge and dotted with negative charge Rutherfold demonstrated that the atom has a tiny, high- mass nucleus, in his experiment
9/16/2020 10:58:53 pm
1. The plum pudding model of an atom was when Rutherford imagined that there was negatively charged electron must be distributed randomly in a positively charged matrix (both electrons and protons in the atom arranged randomly)
9/16/2020 10:59:42 pm
1. The plum pudding model is Thompson’s model of the atomic structure. He imagined that the negatively charged electrons or ‘corpuscles’ must have been distributed in random order within a positively charged matrix. Later Ernest Rutherford conducted an experiment using a thin sheet of gold foil and a screen coated with zinc sulphide, he combined the sheet with alpha particles which were positively charged and very small. In the experiment he observed that some alpha particles were completely deflected, this explained that the positive charges of an atom that which would repel the alpha particles must have been concentrated in an area called the ‘nucleus’. Thus, Rutherford concluded that most of the atom is empty space.
9/16/2020 11:00:55 pm
Plum pudding - Refers to the english desert, the cake represents the positive matrix, the random pieces of fruit represent the electrons. This was a model because it was known that the electrons were not fixated to a spot but were actually "random".
9/16/2020 11:03:12 pm
The plum pudding model is a model proposed, which likened the structure of an atom to a plum pudding, hence electrons with negative charge would be distributed within the overall atom, which has a positive charge, thus causing it to be neutral.
9/16/2020 11:06:33 pm
What is the "plum pudding" model of an atom and how did Rutherford disprove this model
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