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Question

An atom has an atomic number of 19 and a mass number of 39. How many electron ,protons and neutrons does it have?


Solution

The atomic number is the number of protons . In a neutral atom, the number of electrons  equals the number of protons. Mass number is the sum of the protons and neutrons  of a particular isotope. If you have mass number and atomic number, subtract the atomic number from the mass number to get the number of neutrons.

 (Mass number)−(atomic number)=number of neutrons

Here,
Number of protons= atomic number=19

since it is neutral
Number of protons=number of electrons=19

Number of neutrons= mass number - atomic number=39-19=20

Electrons = 19
Protons = 19
Neutrons = 20

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