# To calculete the mass number of the chemival element with,Z=15,knowing that the,number is higher than electron on proton? very nice please !!!

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Z = 15 means there are 15 protons in the element

As number of proton is equal to number of electrons, there are 15 electrons.

From z = 15, you also know that it is Phosphorus.

But z= 15 does not provide information about its atomic mass(mass number). You have to know the number of neutrons init. Number of neutrons is 16 and hence the mass number is (15+16) = 31.

As number of proton is equal to number of electrons, there are 15 electrons.

From z = 15, you also know that it is Phosphorus.

But z= 15 does not provide information about its atomic mass(mass number). You have to know the number of neutrons init. Number of neutrons is 16 and hence the mass number is (15+16) = 31.