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An atom (as from the Periodic Table, which have no charge) will have the same amount of protons as electrons.

The atomic number is the amount of protons an atom has. Lithium has an atomic number of 3, which means it's nucleus contains 3 protons, and in turn 3 electrons.

Once you identify the atom based on it's atomic number, and find it on the periodic table, you can see it's symbol, and weight.

The atomic weight is the amount of protons and neutrons added together, both weighing 1 amu (*Atomic Mass units*: The unit that protons and neutrons are measured). Lithium has an atomic weight of 6.94, so the amount of protons (3) subtracted from 6.94 is 3.94. Now we round up to the nearest whole number and we have 4. Four is the amount of neutrons an atom of Lithium has.

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