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Rutherford. DK the first name.

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What scientist developed the model of the atom shown?

Niels Bohr developed the model of the atom shown in the image. He proposed the planetary model of the atom, where electrons orbit the nucleus in fixed energy levels.


When was the modern atom model invented?

The modern atom model, also known as the planetary model, was proposed by Danish physicist Niels Bohr in 1913. This model refined the understanding of how electrons orbit the nucleus in distinct energy levels.


What does classical theory say about the planetary model of the atom and how does it explain the behavior of electrons within the atom?

Classical theory, also known as the planetary model of the atom, suggests that electrons orbit the nucleus in fixed, circular paths similar to planets orbiting the sun. This model explains the behavior of electrons by proposing that they have specific energy levels and move in stable orbits around the nucleus.


What conclusion did Rutherford draw from his experiment?

Rutherford concluded that an atom has a small, dense, positively charged nucleus surrounded by mostly empty space where electrons orbit. This model later became known as the planetary model of the atom.


What are the differences between the plum pudding and planetary models of the atom?

The plum pudding model describes the atom as a pudding, occupying most of the volume an atom occupies. The pudding is positively charged. Inside the large pudding are negatively charged specs (plums), representing electrons. This model was found to be flawed because, when alpha particles were fired at atoms, it was found that a proportion of the positively charged alpha particles consisting of two neutrons and two protons backscattered. This meant that the positive charge density (charge per unit volume) of the atom must have been greater than what was described by the plum pudding model. For this to make sense, most of the atom must actually have been a vacuum. Therefore, the planetary model was created to describe atom more accurately. In the planetary model (nuclear model), the atom consists of electrons orbiting a nucleus. The nucleus consists of protons and neutrons.