Why do the elements of the same group have similar properties ?

Which process does not require the presence of a physical substance in order to transfer heat? air in the atmosphere is heated by the ground. this warm air then rises, and cooler air falls. this is an example of what type of process? how is conduction different from radiation?

Adepositional also feature that forms where a stream enters a lake or an ocean is a

How many moles are contained in 5.6 l of h2 at stp