The atomic number of an atom indicates the number of protons in its nucleus. In this case, you mentioned that the atomic number is 9. Therefore, the atom has 9 protons.
The number of neutrons does not affect the atomic number, as it represents the number of protons specifically. However, knowing that the atom has 10 neutrons can provide additional information about the atom's mass number.
The mass number (A) of an atom is the total number of protons and neutrons in its nucleus. To calculate the mass number, you can simply add the number of protons (9) and the number of neutrons (10):
Mass number (A) = Number of protons + Number of neutrons = 9 + 10 = 19
Therefore, the atom with an atomic number of 9 and 10 neutrons has 9 protons and a mass number of 19.