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Modern Physics Atomic Structure Exercises

Lithium Atom

Label the parts of the atom marked.





Atomic Number

Atomic number is the number of protons in a nucleus. The mass number is the number of protons plus the number of neutrons. If the atom is neutral the number of protons equals the number of electrons.

Lithium (Li) has 3 protons and (7 – 3 =4) 4 neutrons.

Copy and complete the data table. Atoms are assumed to be electrically neutral.: