Chemical structure of xenon heptafluoride anion

When $\ce{XeF6}$ acts as a fluoride acceptor, $\ce{XeF7-}$ is formed. What is the hybridisation, geometry, and shape of $\ce{XeF7-}$?

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Source: Housecroft, Sharpe, Inorganic Chemistry, Pearson Education Limited, 2005

• As we know that XeF6 has a lone pair of electron then what happens to that lone pair of electron when XeF6 reacts with F-? – Smit Patel May 4 at 18:08