The atomic number of lithium is 3. Its mass number is 7. (a) How many protons and neutrons are present in a lithium atom? (b) Draw the diagram of a lithium atom.



(a) Number of neutrons = Mass number – atomic number

Number of neutrons = 7 – 3 = 4

Number of protons = atomic number

∴ Number of protons = 3

(b) Structure of a lithium atom

Structure of a lithium atom

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