Class 11ChemistryClassification of Elements and Periodicity in PropertiesExtended or long form of periodic table
EasyWhere is helium placed in the periodic table and why?
- AGroup $18$,Period $1$
- BGroup $2$,Period $1$
- CGroup $18$,Period $2$
- DGroup $1$,Period $1$
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Similar Questions
Identify the incorrect match :
Temporary Systematic Name $IUPAC$ Official Name $a$. Unnilunium $(101)$ $i$. Mendelevium $(Md)$ $b$. Unniltrium $(103)$ $ii$. Lawrencium $(Lr)$ $c$. Unnilhexium $(106)$ $iii$. Seaborgium $(Sg)$ $d$. Ununnilium $(110)$ $iv$. Darmstadtium $(Ds)$
| Temporary Systematic Name | $IUPAC$ Official Name |
|---|---|
| $a$. Unnilunium $(101)$ | $i$. Mendelevium $(Md)$ |
| $b$. Unniltrium $(103)$ | $ii$. Lawrencium $(Lr)$ |
| $c$. Unnilhexium $(106)$ | $iii$. Seaborgium $(Sg)$ |
| $d$. Ununnilium $(110)$ | $iv$. Darmstadtium $(Ds)$ |
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 $.....$
In the modern periodic table,which groups of elements are known as $d$-block elements?
Easy
View SolutionWrite the atomic number of the element present in the third period and seventeenth group of the periodic table.
Easy
View SolutionDiscuss the position of $He$ and $H$ in the periodic table.
Difficult
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