Answer:
The element is calcium and it has a neutron number of 21
Explanation:
To solve this, first let us try to determine the number of electrons transferred by the element X. This can be achieved by writing a dissociation equation as shown below:
XCl2 <==> X^2 + 2Cl^-
From the above, it is very clear that the element X transferred 2 electrons to Cl to form XCl2.
From the question we were told that the ion of the element(X^2+) has:
Electron = 18
Mass number = 41
Since the element X gave 2 electrons, it means the proton number of element X = 2+18 = 20
Therefore, the element is calcium.
Now we can calculate the Neutron number:
Number number = Mass number - Proton
= 41 - 20 = 21
