Answer to Question #25554 in Organic Chemistry for Mohammad
An ion X2+(the charge is 2+) contains 18 electron and 20 neutrons.Calculate the atomic number and mass number of X.
number of neutrons = 20
a dipostive cation has 2 electrons less thus originally the no of electrons = 18 + 2 = 20 = atomic number
no. of protons=no of electrons in an neutral atom,
thus no. of protons = 20
Atomic mass = no. of protons + no. of neutrons
atomic mass = 20 + 20 = 40