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What is the mass number of an atom which contains 21 electrons, 21 protons, and 24 neutrons? 21 66 42 45
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3 votes
What is the mass number of an

atom which contains 21 electrons,
21 protons, and 24 neutrons?
21
66
42
45

User Peter Dietz
by
4.0k points

1 Answer

6 votes

Answer:

66 i think

Step-by-step explanation:

because i add 21+21+24=66

User Lilylakshi
by
4.8k points
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