Class 10SciencePeriodic Classification of ElementsMix Examples - Periodic Classification of Elements
Easy"Hydrogen occupies a unique position in the Modern Periodic Table". Justify the statement.
(N/A) Hydrogen is placed in Group $1$ at the top of the alkali metals because it shares properties with both alkali metals and halogens.
$1$. Resemblance with alkali metals: Like alkali metals ($Li, Na, K$, etc.), hydrogen has $1$ valence electron in its outermost shell and forms positive ions $(H^+)$ by losing this electron.
$2$. Resemblance with halogens: Like halogens ($F, Cl, Br$, etc.), hydrogen is a non-metal and requires $1$ electron to complete its valence shell, often forming covalent bonds and negative ions $(H^-)$ in specific conditions.
Due to this dual nature, its position remains unique and debated in the periodic table.
$1$. Resemblance with alkali metals: Like alkali metals ($Li, Na, K$, etc.), hydrogen has $1$ valence electron in its outermost shell and forms positive ions $(H^+)$ by losing this electron.
$2$. Resemblance with halogens: Like halogens ($F, Cl, Br$, etc.), hydrogen is a non-metal and requires $1$ electron to complete its valence shell, often forming covalent bonds and negative ions $(H^-)$ in specific conditions.
Due to this dual nature, its position remains unique and debated in the periodic table.
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Similar Questions
Write true or false for the statement: In Mendeleev's periodic table,elements were arranged in the order of their increasing atomic masses and it was also observed that there occurs a periodic recurrence of elements with similar physical and chemical properties.
Easy
View SolutionThe following table shows elements represented by the letters $A, B, C, D, E, F, G$ and $H$.
Group $1$ $2$ $13$ $14$ $15$ $16$ $17$ $18$ Element $A$ $B$ $C$ $D$ $E$ $F$ $G$ $H$
$(i)$ Which of the elements has the atomic size:
$(a)$ biggest and $(b)$ smallest?
$(ii)$ Which element has valency:
$(a)$ $3$ and $(b)$ zero?
| Group | $1$ | $2$ | $13$ | $14$ | $15$ | $16$ | $17$ | $18$ |
| Element | $A$ | $B$ | $C$ | $D$ | $E$ | $F$ | $G$ | $H$ |
$(i)$ Which of the elements has the atomic size:
$(a)$ biggest and $(b)$ smallest?
$(ii)$ Which element has valency:
$(a)$ $3$ and $(b)$ zero?
Medium
View SolutionName the following:
$(a)$ $A$ metal that can be cut with a knife.
$(b)$ $A$ metal that is liquid at room temperature.
$(c)$ $A$ metal that has $3$ valence electrons.
$(a)$ $A$ metal that can be cut with a knife.
$(b)$ $A$ metal that is liquid at room temperature.
$(c)$ $A$ metal that has $3$ valence electrons.
Medium
View SolutionWhich one of the following elements exhibits the maximum number of valence electrons?
Medium
View Solution$(a)$ Predict which of the following will form anions and which will form cations:
$(i)$ $Na$ $(ii)$ $Al$ $(iii)$ $Cl$ $(iv)$ $O$
$(b)$ Name two elements that are inert.
$(i)$ $Na$ $(ii)$ $Al$ $(iii)$ $Cl$ $(iv)$ $O$
$(b)$ Name two elements that are inert.
Medium
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