313030 Alkali metals are most reducing because

312996 Which of the following elements belongs to first inner transition series?

312997 Statement A :
The \(4 \mathrm{f}\) and \(5 \mathrm{f}\)-series of elements are placed separately in the Periodic table to preserve the principle of classification.
Statement B :
s-block elements can be found in pure form in nature.

312998 Among the following elements how many of them are inner transition elements?
\[\begin{array}{l}
{\rm{(a) Sg}}\,\,\,\,\,{\rm{(b) Bk}}\,\,\,\,{\rm{(c) Er}}\,\,\,\,{\rm{(d) Em}}\\
{\rm{(e) Fe}}\,\,\,\,\,{\rm{(f) Pb}}\,\,\,\,\,\,{\rm{(g) Cr}}\,\,\,\,{\rm{(h) Ca}}\\
{\rm{(i) Ar}}\,\,\,\,\,\,{\rm{(j) Zr}}\,\,\,\,\,\,\,{\rm{(k) Ce}}
\end{array}\]

313030 Alkali metals are most reducing because

312996 Which of the following elements belongs to first inner transition series?

312997 Statement A :
The \(4 \mathrm{f}\) and \(5 \mathrm{f}\)-series of elements are placed separately in the Periodic table to preserve the principle of classification.
Statement B :
s-block elements can be found in pure form in nature.

312998 Among the following elements how many of them are inner transition elements?
\[\begin{array}{l}
{\rm{(a) Sg}}\,\,\,\,\,{\rm{(b) Bk}}\,\,\,\,{\rm{(c) Er}}\,\,\,\,{\rm{(d) Em}}\\
{\rm{(e) Fe}}\,\,\,\,\,{\rm{(f) Pb}}\,\,\,\,\,\,{\rm{(g) Cr}}\,\,\,\,{\rm{(h) Ca}}\\
{\rm{(i) Ar}}\,\,\,\,\,\,{\rm{(j) Zr}}\,\,\,\,\,\,\,{\rm{(k) Ce}}
\end{array}\]

313030 Alkali metals are most reducing because

312996 Which of the following elements belongs to first inner transition series?

312997 Statement A :
The \(4 \mathrm{f}\) and \(5 \mathrm{f}\)-series of elements are placed separately in the Periodic table to preserve the principle of classification.
Statement B :
s-block elements can be found in pure form in nature.

312998 Among the following elements how many of them are inner transition elements?
\[\begin{array}{l}
{\rm{(a) Sg}}\,\,\,\,\,{\rm{(b) Bk}}\,\,\,\,{\rm{(c) Er}}\,\,\,\,{\rm{(d) Em}}\\
{\rm{(e) Fe}}\,\,\,\,\,{\rm{(f) Pb}}\,\,\,\,\,\,{\rm{(g) Cr}}\,\,\,\,{\rm{(h) Ca}}\\
{\rm{(i) Ar}}\,\,\,\,\,\,{\rm{(j) Zr}}\,\,\,\,\,\,\,{\rm{(k) Ce}}
\end{array}\]

313030 Alkali metals are most reducing because

312996 Which of the following elements belongs to first inner transition series?

312997 Statement A :
The \(4 \mathrm{f}\) and \(5 \mathrm{f}\)-series of elements are placed separately in the Periodic table to preserve the principle of classification.
Statement B :
s-block elements can be found in pure form in nature.

312998 Among the following elements how many of them are inner transition elements?
\[\begin{array}{l}
{\rm{(a) Sg}}\,\,\,\,\,{\rm{(b) Bk}}\,\,\,\,{\rm{(c) Er}}\,\,\,\,{\rm{(d) Em}}\\
{\rm{(e) Fe}}\,\,\,\,\,{\rm{(f) Pb}}\,\,\,\,\,\,{\rm{(g) Cr}}\,\,\,\,{\rm{(h) Ca}}\\
{\rm{(i) Ar}}\,\,\,\,\,\,{\rm{(j) Zr}}\,\,\,\,\,\,\,{\rm{(k) Ce}}
\end{array}\]