<span>d)S is not one of them.
Here's an easy way to remember them, attached: </span>
<span>Pass the mixture through filter paper. The large particles in the suspension will filter out. to tell the difference between a solution and a colloid, shine a beam of light through the mixture, if it reflects then it is a colloid, if it doesn't then it is a solution</span>
Answer: BF3
Explanation: boron needs 4 electron to obtain octet and Fluorine has just one. For the valence shell to be completely filled it will have to form BF4- with 4 fluorine atom surrounding it.
Mercury-199 is composed of 80 protons, 119 neutrons, and 80 electrons.
Precipitation :)
Hope it helps
