CHEMISTRY
CHAPTER- ATOMIC STRUCTURE
SYLLABUS:
Atomic structure; Rutherford Model; Spectrum of hydrogen atom; Bohr model; de Broglie relations, Uncertainty principle, Quantum model; Electronic configuration of elements ( upto to atomic number 36); Aufbau principle, Pauli’s exclusion principle and Hund’s rule, shapes of s,p, and d orbitals.
Dalton’s Atomic Theory :
Matter is made up of small indivisible particles, called atoms.
- Atoms can neither be created nor destroyed. This means that a chemical reaction is just a simple rearrangement of atoms and the same number of atoms must be present before and after the reaction.
- Atom is the smallest particle of an element which takes part in a chemical reaction.
- Atoms of the same element are identical in all respects especially, size, shape and mass.
- Atoms of different elements have different mass, shape and size.
- Atoms of different elements combine in a fixed ratio of small whole numbers to form compound atoms, called molecules.