An atom of carbon has a radius of 67. pm and the average orbital speed of the electrons in it is about 1.3 x 10 m/s. Calculate the least possible uncertainty in a measurement of the speed of an electron in an atom of carbon. Write your answer as a percentage of the average speed, and round it to 2 significant digits.

The phase where ice changes directly to gas is called sublimation 

Vander waals forces are inter molecular bonds that exist within molecules of the same substance. a water molecule is made up of oxygen and hydrogen atoms which share electrons between each other. the vander waals forces are forces that exist between multitude of different  molecules of water. dipole dipole forces is the type of vander waals force that exist in water. the oxygen atom which is more electronegative pulls the shared electron closer to itself thus generating a partial negative charge while the hydrogen acquire a partial positive charge. these two different charges causes attraction to occur in water molecules.

The name for subatomic particles in an atom is called a proton