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संक्रमण धातुओं की प्रथम श्रेणी में से कौन-सी धातु मुख्यतः + 1 ऑक्सीकरण अवस्था दर्शाती है तथा क्यों ?

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Cu, क्योंकि यह सरलता से `4s ^(1 )` इलेक्ट्रॉन को निकालकर स्थायी `3d ^(10 )` अभिविन्यास प्राप्त कर लेता है।

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