The formula of a salt is XCl2. The X-ion in this salt has 28 electrons. The metal X is
Responses
A Ni
B Zn
C Fe
D V
The X-ion has 28 electrons, which means that it has the electron configuration of Argon (1s2 2s2 2p6 3s2 3p6).
Looking at the periodic table, Nickel (Ni) has the electron configuration of Argon + 3d8 4s2, which adds up to a total of 28 electrons. Therefore, the metal X in this salt is Nickel (Ni), option A.