Answer:
Proton
Step-by-step explanation:
However, the atom itself is not the smallest known particle, but instead each atom is made up of three individual parts: electrons, protons and neutrons. Furthermore, protons and neutrons themselves are made up of even smaller parts called quarks.
Protons
I'm pretty sure protons are located in an atom
The answer is 10
a + 5 =15
15-5=10
steps 2 and 3 must be switched
e2020
5+9+-23