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38 Which ion in the ground state has the same electron configuration as an atom of neon in the ground state? (1) Ca2+ (2) Cl- (3) Li+ (4) O2-
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If two angles are supplementary and one angle measures 65°, what should be the measure of the other angle?
other angle equals to 115°.

Yes, the Mg2+ ion and the neutral neon atom are called isoelectronic
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