Aradioisotope which is sometimes used by doctors to pinpoint a brain tumor is

Answer : The radioisotope is Technetium - 99.

Explanation :

Technetium is a chemical element whose symbol is Tc.

The atomic number of Tc = 43

It is belongs to the group 7 and period 5.

The element category of Tc is transition metal.

It is the lightest element whose isotopes are all radioactive.

There are many radioisotopes of Tc but Technetium-99 is used in a medical applications.

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.

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