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I NEED HELP NOWWW PLS 20 POINTS FOR RIGHT ANSWER ​

I NEED HELP NOWWW PLS 20 POINTS FOR RIGHT ANSWER ​-example-1
User Steffen
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Answer:

10.

Step-by-step explanation:

The atomic number gives the number of protons an atom has in its nucleus. The mass number gives a sum of the neutrons and protons in the nucleus. Thus an atomic number of 10 means there are 10 protons present.

User Sergei Sirik
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