How many of the following ions produce c...

How many of the following ions produce colour in the bunsen flame when introduced directly or as a mixture with other substance.`K^(+)`,`Rb^(+)`,`Cs^(+)`,`Be^(2+)`,`Mg^(2+)`,`Ca^(2+)`,`Sr^(2+)`,`Ba^(2+)`,`Zn^(2+)`,`BO_(3)^(3-)`

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