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The scientist that developed the iconic atom model that depicts a nucleus surrounded by electrons was Ernest Rutherford. Rutherford developed the model in 1911 after displaying some experiments that showed that the J.J.Thomson model was incorrect. Rutherford's experiment showed that an atom is a small but heavy central particle and is surrounded by a cloud of electrons. This was the opposite of what Thomson's model proposed.
Ernest Futher Ford
Ernest Rutherford published a paper proposing the planetary model in 1911. This followed the experiment performed by Hans Geiger and Ernest Marsden under the direction of Rutherford in 1909, where gold foil was bombarded with alpha particles .
In 1911, Rutherford proposed a new model for the atom. His experiments were the first to show that the atom must consist of a very tiny positively charged nucleus surrounded by negatively charged electrons. (For the record, Rutherford also discovered and named alpha, beta and gamma radiation.)
Rutherford
This was an idea of Ernest Rutherford (1871-1937) from 1911.
In 1911, Ernest Rutherford discovered the nucleus of the atom. Rutherford was born in New Zealand in 1871 and became known as the father of nuclear physics.
The scientist that developed the iconic atom model that depicts a nucleus surrounded by electrons was Ernest Rutherford. Rutherford developed the model in 1911 after displaying some experiments that showed that the J.J.Thomson model was incorrect. Rutherford's experiment showed that an atom is a small but heavy central particle and is surrounded by a cloud of electrons. This was the opposite of what Thomson's model proposed.
He didn't exactly "discover" the nucleus. In 1911 he theorized about the atom having its positive charges in a very small nucleus. In 1921 he postulated about the existence of the neutron in the nucleus. The first experiment to split the atom in a controlled manner was performed by him and two students in 1932.
The Geiger-Marsden experiment, which is also called the gold foil experiment or the Rutherford experiment, was conducted by Hans Geiger and Ernest Marsden in 1909, under Earnest Rutherford's direction. You need a link to the Wikipedia post on this ground-breaking experiment, and we've got one for you.
In 1911 the existence of the atomic nucleus was discovered by Ernest Rutherford through his interpretation of the gold foil experiment conducted two years earlier by Hans Geiger and Ernest Marsden. In 1932 Dmitry Ivanenko proposed the proton-neutron model of the nucleus.
1919 it was actually 1911 http://www.rsc.org/chemsoc/timeline/pages/1911.html
Ernest Rutherford was a New Zealand-born British physicist who became known as the father of nuclear physics. He discovered the nucleus of the atom in 1911.
Ernest Futher Ford
Ernest Rutherford published a paper proposing the planetary model in 1911. This followed the experiment performed by Hans Geiger and Ernest Marsden under the direction of Rutherford in 1909, where gold foil was bombarded with alpha particles .
Dmitri Ivanenko proposed the idea of a neutron and proton nucleus in 1932, the nucleus was itself discovered in 1911 by Ernest Rutherford while reviewing the famous Geiger--Marsden experiment of a few years previous.
Bohr did not discover this. Ernest Rutherford 'discovered' the nucleus. This was done in 1911.