Is heat transferred from colder objects to hotter objects? explain in lots of detail.

Hi There,
I cant explain in many details..
But i can give you a very good example that will help you better understand what is happening
(e.g. When an ice cube is dropped into a hot cup of tea, The ice cube is absorbing the heat in the tea causing it to melt as it gets warmer)

When you bring two objects of different temperature together, energy will always be transferred from the hotter to the cooler object. The objects will exchange thermal energy, until thermal equilibrium is reached, i.e. until their temperatures are equal. We say that heat flows from the hotter to the cooler object. Heat is energy on the move.
Units of heat are units of energy. The SI unit of energy is Joule. Other often encountered units of energy are 1 Cal = 1 kcal = 4186 J, 1 cal = 4.186 J, 1 Btu = 1054 J.
Without an external agent doing work, heat will always flow from a hotter to a cooler object. Two objects of different temperature always interact. There are three different ways for heat to flow from one object to another. They are conduction, convection, and radiation.

They are all full and don't need any more electrons in there outer shell.