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If an element has 20 protons and 20 neutrons in the nucleus of its atoms , what is the mass number of the atom?
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If an element has 20 protons and 20 neutrons in the nucleus of its atoms , what is the mass number of the atom?

User BoppreH
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1 Answer

9 votes

Answer:

A=z+n

A=20+20

A=40

Step-by-step explanation:

Not sure if I'm correct but I was taught that mass number is calculated by A=z+n where A is the mass number, z is the proton number and n is the number of neutrons.

User Mejan
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