1-5.037077324x10^23
Use these magic triangles they will help you a lot
Answer:
protons and electrons
Explanation:
The symbol for an atom can be written to show its mass number at the top, and its atomic number at the bottom. To calculate the numbers of subatomic particles in an atom, use its atomic number and mass number: number of protons = atomic number. number of electrons = atomic number.
Answer:
13-b
Explanation:
because 13-b is close to a and 12