In a regular octahedral molecule MX_6,the num | vedclass

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(A) In a regular octahedral geometry,the central atom $M$ is surrounded by $6$ ligands $X$ arranged at the corners of an octahedron.These $6$ ligands

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$3$

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(A) In a regular octahedral geometry,the central atom $M$ is surrounded by $6$ ligands $X$ arranged at the corners of an octahedron.These $6$ ligands form $3$ linear axes passing through the central atom.Each axis consists of two $X$ atoms positioned at $180^{\circ}$ to each other with respect to the central atom $M$.Therefore,there are $3$ such $X-M-X$ bond angles of $180^{\circ}$.

In a regular octahedral molecule $MX_6$,the number of $X-M-X$ bond angles of $180^{\circ}$ is:

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