How many of the following compounds are found to exist? `BiF_(5), TlCl_(3), PbO_(2), SnCI_(2), Tl_(2)O_(3), PbI_(4), As_(2)O_(3)`
How many of the following compounds are found to exist?
`BiF_(5), TlCl_(3), PbO_(2), SnCI_(2), Tl_(2)O_(3), PbI_(4), As_(2)O_(3)`
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