A) Magnesium and sodium
B) Magnesium and copper
C) Magnesium and barium
D) Magnesium and potassium
Correct Answer: C
Solution :
\[Mg=1{{s}^{2}},2{{s}^{2}}2{{p}^{6}},3{{s}^{2}}\] \[_{56}Ba=\underbrace{1{{s}^{2}}}_{{}},\underbrace{2{{s}^{2}}2{{p}^{6}}}_{{}},\underbrace{3{{s}^{2}}3{{p}^{6}}3{{d}^{10}}}_{{}},\underbrace{4{{s}^{2}}4{{p}^{6}}4{{d}^{10}}}_{{}},\] \[\underbrace{5{{s}^{2}},5{{p}^{6}}}_{{}},\underbrace{6{{s}^{2}}}_{{}}\] Position of Mg = II A-group s-block 3-period Position of Ba = II A-group s-block 6-period So, \[Mg\] and \[Ba\] same group in the periodic table.
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