Which pair below describes isotopes of the same element?
a) an atom with 6 protons and 8 neutrons - an atom with 8 protons and 6 neutrons
b) an atom with 6 protons and 6 neutrons - an atom with 6 protons and 7 neutrons
c) an atom with 8 protons and 8 neutrons - an atom with 7 protons and 8 neutrons
d) an atom with 7 protons and 6 neutrons - an atom with 6 protons and 6 neutrons
8)

B

Explanation:

For exhibit isotopy, atoms of the element must have the same proton number (atomic number) but different mass number.

In Option B

The two atoms have same atomic number (6) but different mass number (12 and 13 respectively).

Mass num = proton number + Neutron number

Unlike the other options.

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.