Barium electronic configuration is (2,8,8,8,8,8,8,6) if this is right then why barium valency is +2? barium valency should be -2

barium electronic configuration is (2,8,8,8,8,8,8,6) if this is right then why barium valency is +2? barium valency should be -2 but why it is not -2?​

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