What is an element?
A. a substance made up of hydrogen and one other kind of atom
B. a substance made of just one kind of atom that cannot be broken down into something simpler
C. a material that is shiny and usually hard and strong
D. a substance made of just one kind of molecule that cannot be broken down into something simpler

Question

What is an element?
	A. 	a substance made up of hydrogen and one other kind of atom
	B. 	a substance made of just one kind of atom that cannot be broken down into something simpler
	C. 	a material that is shiny and usually hard and strong
	D. 	a substance made of just one kind of molecule that cannot be broken down into something simpler

anonymous · Answer

B. is the correct answer.  there only one kind of atom in a given element (ex. a element of oxygen contains only oxygen atoms) and all elements can be broken down into simpler substances