Discuss the position of $d$-block elements in the periodic table.
(N/A) In a periodic table,the $d$-block elements are situated between the $s$-block and $p$-block elements,occupying the large middle section of the periodic table.
The $d$-block elements are present from group-$3$ to group-$12$ in periods $4$ to $7$. These elements have $d$-orbitals in the penultimate energy level of their atoms that receive electrons,giving rise to four rows of transition elements,namely $3d, 4d, 5d$,and $6d$,as follows:
$(i)$ The first transition series or $3d$-series belongs to the $4^{th}$ period.
$(ii)$ The second transition series or $4d$-series belongs to the $5^{th}$ period.
$(iii)$ The third transition series or $5d$-series belongs to the $6^{th}$ period.
$(iv)$ The fourth transition series or $6d$-series belongs to the $7^{th}$ period.
Thus,there are a total of forty elements with ten elements in each series.
The $d$-block elements are present from group-$3$ to group-$12$ in periods $4$ to $7$. These elements have $d$-orbitals in the penultimate energy level of their atoms that receive electrons,giving rise to four rows of transition elements,namely $3d, 4d, 5d$,and $6d$,as follows:
$(i)$ The first transition series or $3d$-series belongs to the $4^{th}$ period.
$(ii)$ The second transition series or $4d$-series belongs to the $5^{th}$ period.
$(iii)$ The third transition series or $5d$-series belongs to the $6^{th}$ period.
$(iv)$ The fourth transition series or $6d$-series belongs to the $7^{th}$ period.
Thus,there are a total of forty elements with ten elements in each series.
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$I$. $Y, La$
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$IV$. $Cr, Mo$
$I$. $Y, La$
$II$. $Zr, Hf$
$III$. $Mo, W$
$IV$. $Cr, Mo$
Given below are two statements :
Statement $I$ : The higher oxidation states are more stable down the group among transition elements unlike $p-$block elements.
Statement $II$ : Copper can not liberate hydrogen from weak acids.
In the light of the above statements,choose the correct answer from the options given below :
Statement $I$ : The higher oxidation states are more stable down the group among transition elements unlike $p-$block elements.
Statement $II$ : Copper can not liberate hydrogen from weak acids.
In the light of the above statements,choose the correct answer from the options given below :
Match the metal ions given in Column-$I$ with the spin magnetic moments of the ions given in Column-$II$ and assign the correct code.
Column-$I$ Column-$II$ $(a) \ Co^{3+}$ $(i) \ \sqrt{8} \ B.M.$ $(b) \ Cr^{3+}$ $(ii) \ \sqrt{35} \ B.M.$ $(c) \ Fe^{3+}$ $(iii) \ \sqrt{3} \ B.M.$ $(d) \ Ni^{2+}$ $(iv) \ \sqrt{24} \ B.M.$ $(v) \ \sqrt{15} \ B.M.$
$(a) \quad (b) \quad (c) \quad (d)$
| Column-$I$ | Column-$II$ |
| $(a) \ Co^{3+}$ | $(i) \ \sqrt{8} \ B.M.$ |
| $(b) \ Cr^{3+}$ | $(ii) \ \sqrt{35} \ B.M.$ |
| $(c) \ Fe^{3+}$ | $(iii) \ \sqrt{3} \ B.M.$ |
| $(d) \ Ni^{2+}$ | $(iv) \ \sqrt{24} \ B.M.$ |
| $(v) \ \sqrt{15} \ B.M.$ |
$(a) \quad (b) \quad (c) \quad (d)$
MediumNEET 2018
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