7 What is a pure lump of the element iron made of?
А
atoms of iron
B
iron mixed with air
compounds of iron
D
iron cells

Which of the following would be an accurate picture of the earth during the summer time of the northern hemisphere?

Most materials are not magnetic because their magnetism has worn off. their magnetic domains are arranged randomly. they lack magnetic fields. earth’s heat has destroyed their magnetism.

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %