Structure of atom
When scientists started exploring matter, they discovered that the smallest particle of an element that maintains its chemical identity through all chemical and physical changes is called and 'atom'.
A Search for the Particles of Atom of Electrons
Although Dalton's theory of the existence of atoms was published in 1808, there was no clear idea of what an atom might look like until the early part of the twentieth century.
The Structure of the Atom
Scientific investigation on the structure of atom and its subatomic particles is an area where still absorbs scientists.
Atomic Number, Mass Number or Nucleon Number
The nuclei of atoms are made up of protons and neutrons. These two components of the nucleus are referred to as nucleons.
Arrangement of Electrons in an Atom (Bohr-Bury Scheme)
Electrons revolve around the nucleus in different energy levels or shells and each shell is associated with definite energy.
Valence Shell and Valence Electron
The outermost shell of an atom is called its Valence shell. It is the decisive shell during a chemical reaction.
Isotopes
It is interesting to note that atoms of a given atomic number can have different number of neutrons.
Summary
The nucleus contains protons and neutrons collectively called nucleons. It is positively charged. The mass of an atom is concentrated in the nucleus.
Question and Answers
Question and Answers 1
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Multiple Choice Questions
