Uncertainty of the data hope its help you
Answer:
Subatomic particles making up an atom
Explanation:
Atom is the smallest unit of any matter
An atom consists of three subatomic particles - Protons, Neutrons, Electrons. Major atomic mass is in the nucleus ie a tiny deep area at the centre. Nucleus consists nucleons, which includes protons (positively charge) & neurons (neutrally charged). Negatively charged electrons are outside the central nucleus.
Solids are packed together closely, liquids are farther apart but still relatively close, and gases are very far apart with lots of space.
Yes it is a exothermic reaction.
