Atoms are smallest particle of any entity; Atoms consist of three fundamental types of particles, protons, electrons and neutrons. Option C & D are the correct statement.
Define an atom?
Atoms are the smallest particle of an element. Atoms cannot be broken into sub parts. It consisting of 3 particles like, protons, electrons and neutrons.
Atoms of the all substance do not have same chemical properties. Because, atoms have different number of proton and electrons. Atoms cannot be destroyed by heating or cooling. Smallest unit atoms have elemental chemical identity and atoms can combine to make all the substance on earth.
Therefore, statement C and D are correct.
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