Chemical Bonding and Molecular Structure

  • Question 1
    CBSEENCH11005554

    What are valence electrons?

    Solution
    Valence electrons are electrons which present in the outermost orbit.
    Question 2
    CBSEENCH11005555

    Why do atoms combine?

    Solution

    Atoms combine because they tend to complete their octets or duplets in the case of H, Li and Be. Another reason for the combination of atoms is the lowering of enthalpy that takes place when atoms combine together.

    Question 3
    CBSEENCH11005556

    Can ionic bond be formed between similar atoms?

    Solution
    No, it cannot be formed.
    Question 4
    CBSEENCH11005557

    Why two helium atoms do not combine to form He2?

    Solution

    (i) Each helium atom has a fully filled orbital whereas only half filled atomic orbitals combine to form a bond.
    (ii) When two helium atoms approach each other, new forces of repulsion are greater than the forces of attraction.

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