GCE O-Level Practice Test
O-Level Combined Science
What is an atom and what are its three main subatomic particles?
Select your answer
A
Atoms have only two particles
B
An atom is the smallest unit of an element, consisting of protons (positive, in nucleus), neutrons (neutral, in nucleus), and electrons (negative, orbiting the nucleus)
C
Atoms are made of molecules
D
Atoms have no internal structure
Hint
