Answer:
17
Step-by-step explanation:
The number of elementary particles in the atom X = 52
The mass number of atom X = 35
The information required = The atomic number
The number elementary particles of the atom = The number of protons + The number of neutrons + The number of electrons
The mass number of an atom = The number of protons + The number of neutrons
∴ The number of electrons = The number elementary particles of the atom - The number elementary particles of the atom
The number of electrons = 52 - 35 = 17
In a neutral atom, the number of protons = The number of electrons = 17
The atomic number of atom, X = The number of protons in X = 17