* Atomic Number: Lithium's atomic number is 3. This means it has 3 protons.
* Neutrons: Lithium has two common isotopes:
* Lithium-6 (with 3 protons and 3 neutrons)
* Lithium-7 (with 3 protons and 4 neutrons)
* Electrons: Atoms are electrically neutral, so they have the same number of protons and electrons. Lithium has 3 electrons.
Therefore:
* Lithium-6: 3 protons + 3 neutrons + 3 electrons = 9 subatomic particles
* Lithium-7: 3 protons + 4 neutrons + 3 electrons = 10 subatomic particles
