If the formula is XCl2, the X ion has a charge of +2 since each Cl ion has a charge of -1.
Then if the X ion has 28 electrons with a charge of +2, it must have 30 protons.
Its atomic number is 30, which makes it zinc. The metal X is Zn. Choice b is correct.
The metal X is zinc, Zn
Explanation:
Given:
Salt with formula [tex]XCl_2[/tex].
The X-ion has 28 electrons
To find:
The metal X
Solution:
In the salt [tex]XCl_2[/tex], there are two halogen atoms which means that must have borrowed the one-electron each from the central atom X.
Number of electrons in X-ion = 28
So, the total number of electrons in the atom of X will be:
28 + 2 = 30
And as we know that atom is electrically neutral that an equal number of electrons and protons are present in it.
Number of protons = Number of electron = 30
Number of protons in X atom = 30
Atomic number of X = Number of protons = 30
The atomic number of Ni, Zn, Fe, and V are 28, 30, 26, and 23 respectively.
So, from this, we can conclude that the metal X is zinc, Zn.
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