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Since it is in group 2, It will have 2 electrons in its outer most energy shell. 
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It is an element of group -2 and it's electronic configuration is 1s² 2s² 2p⁶ 3s² 3p⁶ 3d¹° 4s²  4p⁶ 4d¹° 5s² 5p⁶ 6s².
therefore it's outer most orbit is n = 6 , in which no. of the electrons are 2

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