PERIODIC CLASSIFICATION OF ELEMENTS

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Across
  1. 2. , , According to this rule, e-s are filled in lower energy orbitals before the higher energy orbitals.
  2. 4. , , Elements having same valence ______ are placed in same period.
  3. 7. , , This principle states that no two e-s in an orbital can have same four quantum nos.
  4. 9. , , The tendency of repetition of similar characters at regular intervals.
  5. 10. , , It is a metalloid, lustrous, brittle & a component in computer chips.
Down
  1. 1. , , No. of electrons to fill the outermost shells of an atom is called _____ shell
  2. 3. , , Group 3 to 12 are known as ____ metals.
  3. 5. , , Who proposed the Modern Periodic Table?
  4. 6. , , Group 17 elements are known as _____
  5. 8. , , Which is the shortest period in the periodic table?