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What is the mass number of an element if it's atom contains 10 protons, 10 electrons and 12 neutrons.​
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What is the mass number of an element if it's atom contains 10 protons, 10 electrons and 12 neutrons.​

User BushyMark
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1 Answer

1 vote

Answer:

20

Step-by-step explanation:

Because mass number is equal to Atomic number.

User Waj
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