Weegy: 40 degrees celsius is 313.15 kelvins. User: What are the three particles of an atom?
A. Proton, neutron, and electron
B. Neutron, electron, and ion
C. Electron, proton, and isotope
D. Proton, ion, and valencium
Weegy: The three particles of an atom are protons,neutrons and electrons.
Answer is A. Proton, neutron, and electron