No it wont.
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Yes, Cr3+ will have a noble gas configuration. It will have the electron configuration of argon (Ar) due to the loss of three electrons from the chromium atom.
No, Ni2+ does not have a noble gas configuration. A noble gas configuration is attained when an atom has a full valence shell of electrons, like the noble gases in Group 18 of the periodic table. Ni2+ has lost electrons to achieve a stable electron configuration but does not have a full valence shell like a noble gas.
neon
The noble gas electron configuration of radon is [Xe]4f145d106s26p6.
The noble gas configuration of holmium is [Xe] 4f^(11) 6s^2. This means that it has the same electron configuration as xenon (Xe) plus two more electrons in the 6s orbital.
The noble gas configuration of oxygen (O) is [He] 2s^2 2p^4, where [He] represents the electron configuration of the nearest noble gas, helium.