Respuesta :
Answer : The mass number for this element is 266.
Explanation :
Isotope : It is defined as the element that have the same number of protons but have the different number of neutrons of each of the atom.
Atomic number is defined as the number of protons or number of electrons.
Atomic number = number of protons = number of electrons
Mass number is defined as the sum of number of protons and number of neutrons.
Number of neutrons = Mass number - Number of protons
As we are given :
Number of electrons in an ion = 108
Number of neutrons in an ion = 157
So, number of protons in an ion = 108
For neutral atom, the number of electrons will be:
Number of electrons = Number of protons in an ion + Charge
Number of electrons = 108 + (+1) = 108 + 1 = 109
Now we have to determine the mass number for this element.
Number of neutrons = Mass number - Number of protons
Mass number = Number of neutrons + Number protons
Mass number = 157 + 109
Mass number = 266
Therefore, the mass number for this element is 266.
The mass number of the ion is 266
The mass number of an element is simply obtained by calculating the sum of the Proton and Neutron in the nucleus of the atom of the element i.e
Mass number = Proton + Neutron
To solve the question given above, we'll begin by calculating the number of protons in the ion. This can be obtained as follow:
Electron = 108
Charge = +1
Proton =?
Charge = Proton – Electron
1 = Proton – 108
Collect like terms
1 + 108 = Proton
Proton = 109
Finally, we shall determine the mass number of the ion. This can be obtained as follow:
Proton = 109
Neutron = 157
Mass number =?
Mass number = Proton + Neutron
Mass number = 109 + 157
Mass number = 266
Therefore, the mass number of the ion is 266
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