What is the name of the group 8 elements and what makes them special?

If soap hits the floor, is the soap dirty or the floor

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

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?