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(2)9th group
Explanation:
Group no. = no. Of valence subshell electrons + any unfilled electrons in previous orbitals
4f shell is fully filled so it will not be taken into consideration.
The 5d shell is partially filled & has 7 electrons
The 6s shell is the valence shell and has 2 electrons
Therefore,
Group no. = 7+2=9
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