The atomic number of lithium is 3. How many neutrons does an atom of lithium have…
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Question “The atomic number of lithium is 3. How many neutrons does an atom of lithium have…”
Answer
Here, A is the atomic number. It refers to the number of protons.
Z = mass number = number protons + number neutrons
The chemical symbol for an element is X.
No. number of protons = number of electrons
So, if the atomic number Li is 3. then A = 3.
i.e. Mass number = 7 = Z.
However, Li atomic number = number of protons = 3.
We know Z = protons + neutrons
Then 7 = 3 + neutrons
Neutrons =
7-3 = 4.
No of protons = 3. number of neutrons = 4, number of electrons = 3.
Conclusion
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