atomic models

fig.12.1 - Space Models of 2-Butenes Note that the atoms are arranged in two different ways in I and II. The two CH 3 groups lie on the same side in I and on the opposite sides in II. When two similar atoms or groups lie on the same side, the isomerism is call..

The atom of an element consists of a small, positively charged nucleus in the centre, which carries almost the entire mass of the atom. The electrons are revolving around the nucleus at high speed. The number of electrons in an atom is equal to the number of protons..

Atomic Structure..

Ernest Rutherford, an energetic Scientist From New Zealand working in England, was studying the properties of particles spontaneously emitted by radioactive substances. Of particular interest was a positively charged, relatively heavy emission named alpha particle. Quantities of such particles ar..

The wave character of an electron and uncertainty in its position and momentum gave a serious blow to Bohr's model of an atom. According to Bohr, the electrons revolve around the nucleus in certain well-defined circular orbits. But the idea of uncertainty in position and velocit..

In the nineteenth century scientists saw enough evidence to prove that each element has its distinctive atom. But all tem atoms contain identical electrons. In spite of the fact that electrons carry negative charge, atoms as whole were found to be neutral. This led to ..

Question: What is the drawback of Rutherford's nuclear model of the atom? Answer: Drawback of Rutherford's nuclear model: It could not explain the stability of the atom because according to the electromagnetic theory if the charged particle undergo..

Dalton had postulated that matter is made up of atoms, which are indivisible. Thomson was the first to suggest a structure for an atom. According to him, an atom is a positively charged sphere of radius=10 - 1 0 m in which the mass and the positive charge of t..

Intensive investigation by scientists over the years led to the development of a mental model (the minuscule particles couldn't be actually seen at that time) known as 'dynamic particle model'. All matter is assumed to be made up of particles that are very small, which may be h..

Question: Describe Rutherford's model of an atom. Answer: The atom of an element consists of a small positively charged nucleus which is situated at the centre of the atom and which carries almost the entire mass of the atom. The ele..