An element \'X, forms compounds of the formula `XCl_(3),X_(2)O_(5)& Ca_(3)X^(2)` but does
Channel: Doubtnut
Date: 2020-02-16

An element \'X, forms compounds of the formula `XCl_(3),X_(2)O_(5)& Ca_(3)X^(2)` but does not form `XCl_(5)`, which of the following is the elements (X) :-