Which of the following elements is man-made?
- A$Ra$
- B$Fr$
- C$Rn$
- D$Lr$
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Which of the following statements regarding transition elements is $NOT$ $CORRECT$?
Which of the following pairs does not consist of isoelectronic species? (Atomic numbers: $Sm = 62, Er = 68, Yb = 70, Lu = 71, Eu = 63, Tb = 65, Tm = 69$)
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View SolutionThe number of $d$-electrons in $Cr^{3+}$ ion $(Z=24)$ is
Which of the following metals exists in a liquid state during the summer season?
Match the following metal ions with their respective colours:
Metal ion Colour $A. V^{4+}$ $I. Colourless$ $B. Ti^{3+}$ $II. Purple$ $C. Ti^{4+}$ $III. Green$ $D. Ni^{2+}$ $IV. Blue$ $V. Yellow$
| Metal ion | Colour |
|---|---|
| $A. V^{4+}$ | $I. Colourless$ |
| $B. Ti^{3+}$ | $II. Purple$ |
| $C. Ti^{4+}$ | $III. Green$ |
| $D. Ni^{2+}$ | $IV. Blue$ |
| $V. Yellow$ |
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