The number of electons of an atom with mass number of 64 and neutron number of 35 is 29 electrons.
The mass number of an atom is its total number of protons and neutrons.
Therefore, the sum of protons and the neutrons is the mass number of an atom.
Therefore, for an electronically neutral atom, the number of protons is equals to the number of electrons.
The nuclues house the protons and the nuetrons and it determines the weight of an atom.
The electron revolves around the nuclues.
Therefore,
number of electrons = 64 - 35 = 29 electrons.
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