Um átomo x possui 8 neutrons e seu número atômico e igual a 8. sabendo que esse atomo é isótopos de y, que possui número de massa 18, responda: qual o numero de nêutrons do atomo y ?

Isotopes are defined as the atoms which have same number of protons but different number of neutrons of same element. Since the proton number is same, the atomic number also same. Hence the atomic number of Y is 8.

Mass number = atomic number + neutron number

                   18 = 8 + neutron number

Neutron number = 10

Hence, there are 10 neutrons in Y.

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