A substance which cannot be split up into two or more simpler substances by the usual chemical methods of applying heat, light or electric energy is called:

A substance which cannot be split up into two or more simpler substanc

1.	A substance which cannot be split up into two or more simpler substances by the usual chemical methods of applying heat, light or electric energy is called:
A.	Element
B.	Atom
C.	Nucleus
D.	Matter
Answer» B. Atom