Science / Chemistry / Colloid: A colloid is a heterogeneous mixture composed of tiny particles suspended in another material. The particles are larger than molecules but less than 1 ?µm in diameter. Particles this small do not settle out and pass right through filter paper. Milk is an example of a colloid. The particles can be solid, tiny droplets of liquid, or tiny bubbles of gas; the suspending medium can be a solid, liquid, or gas (although gas-gas colloids aren't possible).
Science / Periodic Table of Elements / Technetium (Tc): Atomic number: 43, Atomic mass: (99) g.mol -1, Electronegativity: 1.9, Density: 11.5 g.cm-3 at 20°C, Melting point: 2200 oC, Boiling point: 4877 oC, Vanderwaals radius: 0.128 nm, Isotopes: 9, Electro MORE
Science / Chemistry / Sol: A colloid with solid particles suspended in a liquid. Examples are protoplasm, starch in water, and gels. MORE