What is the atomic number of an atom with mass number 9 and 5 electrons?

What is the atomic number of an atom with mass number 9 and 5 electrons?
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The atomic number is the number of ProtonsThe mass number is the number of Protons and NeutronsThe number of Electrons always equals the number of ProtonsTherefore according to the above information the atomic numberof the atom is 5HOWEVER there is NO element with a mass number (Atomic Mass) of9 with an atomic number of 5.You question is impossible to answer.Beryllium has an Atomic mass of 9.0122 and an Atomic number of4Boron has an Atomic mass of 10.811 and an Atomic number of 5
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