What role did John Dalton JJ Thomson and Ernest Rutherford play in the discovery of the atom?

What role did John Dalton JJ Thomson and Ernest Rutherford play in the discovery of the atom?

John Dalton proposed the first atomic theory, J.J. Thomson discovered the electron, Ernest Rutherford discovered the nucleus and Niels Bohr is known for the Bohr model in which electrons are in orbits outside the nucleus. Here’s some more detail: Dalton described atoms as tiny, indivisible and indestructible particles.

What contribution to atomic theory is associated with Dalton?

Dalton’s atomic theory proposed that all matter was composed of atoms, indivisible and indestructible building blocks. While all atoms of an element were identical, different elements had atoms of differing size and mass.

What is the relationship between Dalton and Democritus atomic theory?

Democritus atomic theory is the ancient theory that describes the nature of matter in terms of atoms whereas Dalton atomic theory is a modern scientific theory that describes the nature of matter in terms of atoms.

What did John Dalton revive and what conclusions did he make?

Dalton came up with his theory of atoms as a result of his research into gases. Based on his observations of six different liquids, Dalton concluded that the variation of vapor pressure for all liquids was equivalent, for the same variation of temperature, and the same vapor of any given pressure.

How does Mendeleev and Lothar Meyer differ in the way they arranged the elements in the periodic table?

Mendeleev created the first periodic table and was shortly followed by Meyer. They both arranged the elements by their mass and proposed that certain properties periodically reoccur. Meyer formed his periodic law based on the atomic volume or molar volume, which is the atomic mass divided by the density in solid form.

How did Lothar Meyer contribute to the periodic table?

Meyer did contribute to the development of the periodic table in another way though. He was the first person to recognise the periodic trends in the properties of elements, and the graph shows the pattern he saw in the atomic volume of an element plotted against its atomic weight.

How is Daltons model the same as Democritus model?

How is Dalton’s model different to Democritus’ model? Atoms combine to form different compounds, whereas Democritus has only atoms of the same type combining, for example: wood atoms combine to form tree trunks. How is Crookes’ model the same as Dalton’s model? Atoms are still solid spheres.