The smallest particle of an element is _______.
Molecule is the smallest unit of _______.
Cl2 is an example of ______.
NaCl is an example of ______.
Elements combine together to form a new substance, which is called ______.
A molecule of chlorine is made of ______ atoms of chlorine.
A substance which cannot be further broken down into other simpler substances is called ______.
Which of these are matters?