People sitting around a campfire are able to feel the heat from the fire. how are the people able to feel the heat from the fire without touching the fire?

100mg magnesium reacts with 20ml of 1.0m hcl

From the options provided for each element below, choose the properties that it may have based on its location in the periodic table fluorine (f): highly reactive nonmetal shiny a conductor

How might this scientific phenomena be explained? a paper clip floats on water.