Answer:
True
Explanation:
if there was nothing to avoid of objects pulling towards one another many results may happen
solution:
You need to find the frequency, and they have already given you the wavelength. And since you already know the speed of light, you can use formula (2) to answer this problem. Remember to convert the nano meters to meters because the speed of light is in meters. 

So we end up with a total of four oxygen atoms for this calcium acetate unit and guys that truly it for this one.
Answer:
Particles of matter possess energy called kinetic energy.
Solid cannot be compressed, but gases are highly compressible.
The Kinetic energy of molecules of gases is very large & solids the least.
On heating a sublimable liquid, the molecules break free & escape from the surface of the solid directly into vapour.
Particles of matter move more rapidly on the application of heat
Assuming it has no electrical charge, your electron count would be equal to the atomic number.