Answer:Competing explanations' experiments on atoms gave a perfect modal of an atom
Explanation
There is a long story of atom. Different scientist gave different theories related to atomic modal but no one individually gave a perfect modal they perfect each other work and finally we got a perfect modal of atom.
Here is a short story of atom
in 400 B.C.E, Democritus was the first philosopher who gave the concept of atom. He believes that everything is made up of tiny spheres and these spheres are known as atoms.
in 1803, Dalton said that atoms of an element are similar. For example all atoms of carbon are similar.
in 1904 J. J. Thomson proposed that atom is sphere in which positively charged matter is filled and electrons are randomly scattered in that positively charged matter.
in 1911, Rutherford gave the concept of nucleus he believed that at the center of atoms all positively charged particles are present and this center is known as nucleus. He said that negatively charge electrons revolves around the nucleus in particular orbit.
In 1913, Niels Bohr gave a new model he believes that atomic model is similar to planetary modal. He believed that the electrons in an atom revolves around the nucleus in sets of orbits in a similar manner like the planets revolves around the sun.
In 1919, Rutherford gave the concept of proton.
In 1932, James Chadwick gives the concept of neutron.
In this way different scientist gave different theories related to atoms and finally they all gave a perfect modal of atom.
