A. Fe B. Co C. Pt D. Ni
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A. Their atomic size are nearly the same B. They have unpaired electrons C. Their IE are similar D. They are all metals
A. Zn, Hg B. Mo, W C. Fe, Co D. Nb, Ta
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A. Cs and F B. Cl and F C. P and O D. H and O
A. C B. F C. Be D. N E. Ne
A. Chlorine B. Oxygen C. Sulphur D. Fluorine
A. 7,15 B. 6,12 C. 9,17 D. 3,12
A. Increase down the group B. Decrease down the group C. Remains unchanged D. The variations is not regular
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A. Diamond B. Graphite C. Fools gold D. Rock salt