| તત્વ | ઇલેક્ટ્રોનિક રચના |
| બેરિલિયમ $(Be)$ | $1s^{2} 2s^{2}$ |
| મેગ્નેશિયમ $(Mg)$ | $[Ne] 3s^{2}$ |
| કેલ્શિયમ $(Ca)$ | $[Ar] 4s^{2}$ |
| સ્ટ્રોન્શિયમ $(Sr)$ | $[Kr] 5s^{2}$ |
| બેરિયમ $(Ba)$ | $[Xe] 6s^{2}$ |
| રેડિયમ $(Ra)$ | $[Rn] 7s^{2}$ |
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| $A$. $Be$ | $I$. $1.74$ |
| $B$. $Mg$ | $II$. $1.84$ |
| $C$. $Ca$ | $III$. $2.63$ |
| $D$. $Sr$ | $IV$. $1.55$ |
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