an atom x has 7 electron and 7 neutron. find the mass number of x
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No. of protons = no. of electrons = 6 = Atomic number
Given that mass number = no. of protons + no. of neutrons = 12
Therefore no. of neutrons = 12 - 6 = 6
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Answer:
nitrogen because of nitrogen has 7 electron and 7 neutrons
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