Explanation:
Protons and neutrons are subatomic particles found in the atom of any substance.
These particles collectively determines the mass number of the atom.
- Protons are positively charged particles found in the nucleus of an atom.
- Neutrons do not carry any charges and are also found in the nucleus.
- Electrons are negatively charged particles.
Electrons occupy the extranuclear space of an atom.
Number 2 because they are still developing
Cytosine pairs with guanine and thymine pairs with adenine.
