Class 11ChemistryClassification of Elements and Periodicity in PropertiesExtended or long form of periodic table
EasyWhich are the starting elements in periods $1$ to $7$?
(N/A) The starting elements of each period in the periodic table correspond to the alkali metals (except for period $1$,which starts with Hydrogen). The elements are as follows:
| Period | Starting Element |
|---|---|
| $1$ | $H$ |
| $2$ | $Li$ |
| $3$ | $Na$ |
| $4$ | $K$ |
| $5$ | $Rb$ |
| $6$ | $Cs$ |
| $7$ | $Fr$ |
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Similar Questions
Assign the position of the element having outer electronic configuration in the periodic table:
$(i)$ $ns^{2} np^{4}$ for $n=3$
$(ii)$ $(n-1)d^{2} ns^{2}$ for $n=4$
$(iii)$ $(n-2)f^{7} (n-1)d^{1} ns^{2}$ for $n=6$
$(i)$ $ns^{2} np^{4}$ for $n=3$
$(ii)$ $(n-1)d^{2} ns^{2}$ for $n=4$
$(iii)$ $(n-2)f^{7} (n-1)d^{1} ns^{2}$ for $n=6$
Medium
View SolutionExplain the nomenclature of elements having an atomic number greater than $100$.
Element $E$ belongs to the period $4$ and group $16$ of the periodic table. The valence shell electron configuration of the element,which is just above $E$ in the group is $.....$
Atomic numbers of three elements $E_1$,$E_2$ and $E_3$ of the periodic table are $Z_1$,$50$ and $Z_2$ respectively. From the position of the elements shown in the figure,the value of $(Z_2 - Z_1)$ is:
Who developed the long form of periodic table?
Easy
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