KIPS 9th Class Chemistry Notes Unit 2: Structure of Atoms

Study Online and Download KIPS 9th Class Chemistry Notes Unit 2: Structure of Atoms.

KIPS 9th Class Chemistry Notes Unit 2: Structure of Atoms

Study Online and Download KIPS 9th Class Chemistry Notes Unit 2: Structure of Atoms. Ancient Greek philosopher Democritus suggested that matter is composed of tiny indivisible particles called atoms. The name atom was derived from the Latin word 'Atomos' meaning indivisible. In the beginning of 19th century John Dalton put forward Atomic Theory. According to it 'all matter is made up of very small indivisible particles called atoms'. Till the end of 19th century it was considered that atom cannot be subdivided. However, in the beginning of 20th century experiments performed by Goldstein, J. J. Thomson, Rutherford, Bohr and other scientist revealed that atom is made up of subatomic particles like electron, proton and neutron. Properties of these subatomic particles will be discussed in this chapter.

Students will be able to:
  • Describe the contributions that Rutherford made to the development of the
  • Atomic Theory.
  • Explain how Bohr's atomic theory differed.
  • Describe the structure of atom including the location of the proton, electron and neutron.
  • Define isotopes.
  • Compare Isotopes of an atom.
  • Discuss the properties of the isotopes of H, C, CI, U.
  • Draw the structure of different isotopes from mass number and atomic
  • number.
  • State the importance and uses of isotopes in various fields of life.
  • Describe the presence of subshells I shell.
  • Distinguish between shells and subshells.
  • Write the electronic configuration of first 18 elements in the Periodic Table.

KIPS 9th Class Chemistry Notes Unit 2: Structure of Atoms

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