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  1. Equal masses of H₂, O₂ and methane have been taken in a container of volume
  2. The number of d-electrons in Fe²⁺(Z=26) is not equal to the number of electrons
  3. The element, with atomic number 118, will be
  4. Beryllium and aluminium exhibit many properties which are similar.
  5. Boron has two stable isotopes, ¹°B(19%) and ¹¹B(81%). Average atomic weight