The valence electrons of representative elements are - 
•in s orbitals only
•located in outer most energy level
• located near to nucleus
•located in d orbitals a
• Other:

located in outer most energy level

Explanation:

For example

Sodium has 1 electron in outer most shell .So it's valency is 1

Option "located in outer most energy level" is correct

Explanation:

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a  solution  is always transparent, light passes through with no scattering from solute particles which are molecule in size. the  solution  is homogeneous and does not settle out. a colloid is intermediate between asolution  and a  suspension. while asuspension  will separate out a colloid will not.