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

asked Aug 5, 2021 16.5k views

3 votes

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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6 votes

Answer:

66 i think

Step-by-step explanation:

because i add 21+21+24=66

Lilylakshi answered Aug 10, 2021

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