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The atomic number is the number of Protons

The mass number is the number of Protons and Neutrons

The number of Electrons always equals the number of Protons

Therefore according to the above information the atomic number of the atom is 5

HOWEVER there is NO element with a mass number (Atomic Mass) of 9 with an atomic number of 5.

You question is impossible to answer.

Beryllium has an Atomic mass of 9.0122 and an Atomic number of 4

Boron has an Atomic mass of 10.811 and an Atomic number of 5

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Q: What is the atomic number of an atom with mass number 9 and 5 electrons?
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Related questions

Explain the difference between atomic mass and atomic number?


What can be determined by looking at the atomic number of an element?

the number of protons in an atom and the number of electrons in an atom


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