which is the ground state electronic configuration of an alkaline earth metal?\n\na) ( 1 s ^ { 2 } 2 s ^ { 2…

which is the ground state electronic configuration of an alkaline earth metal?\n\na) ( 1 s ^ { 2 } 2 s ^ { 2 } 2 p ^ { 6 } 3 s ^ { 2 } 3 p ^ { 6 } 4 s ^ { 2 } 3 d ^ { 10 } 4 p ^ { 2 } )\nb) ( 1 s ^ { 2 } 2 s ^ { 2 } 2 p ^ { 6 } 3 s ^ { 2 } 3 p ^ { 6 } 4 s ^ { 2 } )\nc) ( 1 s ^ { 2 } 2 s ^ { 2 } 2 p ^ { 6 } 3 s ^ { 2 } 3 p ^ { 6 } 4 s ^ { 2 } 3 d ^ { 2 } )\nd) ( 1 s ^ { 2 } 2 s ^ { 2 } 2 p ^ { 6 } 3 s ^ { 2 } 3 p ^ { 6 } 4 s ^ { 1 } )

which is the ground state electronic configuration of an alkaline earth metal?\n\na) ( 1 s ^ { 2 } 2 s ^ { 2 } 2 p ^ { 6 } 3 s ^ { 2 } 3 p ^ { 6 } 4 s ^ { 2 } 3 d ^ { 10 } 4 p ^ { 2 } )\nb) ( 1 s ^ { 2 } 2 s ^ { 2 } 2 p ^ { 6 } 3 s ^ { 2 } 3 p ^ { 6 } 4 s ^ { 2 } )\nc) ( 1 s ^ { 2 } 2 s ^ { 2 } 2 p ^ { 6 } 3 s ^ { 2 } 3 p ^ { 6 } 4 s ^ { 2 } 3 d ^ { 2 } )\nd) ( 1 s ^ { 2 } 2 s ^ { 2 } 2 p ^ { 6 } 3 s ^ { 2 } 3 p ^ { 6 } 4 s ^ { 1 } )

Answer

Brief Explanations:

Alkaline earth metals are in Group 2 of the periodic table. Their general electron - configuration is (ns^{2}), where (n) represents the principal quantum number of the outermost shell.

  • Option A: The electron - configuration (1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{10}4p^{2}) corresponds to Ge (Germanium), which is a p - block element ((4p^{2}) outer - shell electrons).
  • Option B: The electron - configuration (1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}) has the outer - shell configuration (4s^{2}). If (n = 4), the element is Ca (Calcium), which is an alkaline earth metal.
  • Option C: The electron - configuration (1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2}3d^{2}) corresponds to Ti (Titanium), a d - block (transition) element.
  • Option D: The electron - configuration (1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{1}) corresponds to K (Potassium), an alkali metal ((ns^{1}) outer - shell configuration).

Answer:

B. (1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}4s^{2})