Class 10SciencePeriodic Classification of ElementsMix Examples - Periodic Classification of Elements
MediumAtomic radii of the elements of the second period are given below :
Period $II$ elements $B$ $Be$ $O$ $N$ $Li$ $C$ Atomic radius $(pm)$ $88$ $111$ $66$ $74$ $152$ $77$
$(i)$ Arrange them in decreasing order of their atomic radii.
$(ii)$ Are the elements now arranged in the pattern of a period in the Periodic Table?
$(iii)$ Which elements have the largest and the smallest atoms?
$(iv)$ How does the atomic radius change as you go from left to right in a period?
| Period $II$ elements | $B$ | $Be$ | $O$ | $N$ | $Li$ | $C$ |
| Atomic radius $(pm)$ | $88$ | $111$ | $66$ | $74$ | $152$ | $77$ |
$(i)$ Arrange them in decreasing order of their atomic radii.
$(ii)$ Are the elements now arranged in the pattern of a period in the Periodic Table?
$(iii)$ Which elements have the largest and the smallest atoms?
$(iv)$ How does the atomic radius change as you go from left to right in a period?
(A) $(i)$ The elements of the second period in the decreasing order of their atomic radii are:
$(ii)$ Yes,the elements are now arranged in the pattern of a period in the Periodic Table.
$(iii)$ $Li$ has the largest atomic radius $(152\,pm)$ and $O$ has the smallest atomic radius $(66\,pm)$.
$(iv)$ The atomic radius decreases as we move from left to right in a period because the nuclear charge increases,which pulls the electrons closer to the nucleus.
| Element | $Li$ | $Be$ | $B$ | $C$ | $N$ | $O$ |
| Radius $(pm)$ | $152$ | $111$ | $88$ | $77$ | $74$ | $66$ |
$(ii)$ Yes,the elements are now arranged in the pattern of a period in the Periodic Table.
$(iii)$ $Li$ has the largest atomic radius $(152\,pm)$ and $O$ has the smallest atomic radius $(66\,pm)$.
$(iv)$ The atomic radius decreases as we move from left to right in a period because the nuclear charge increases,which pulls the electrons closer to the nucleus.
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Similar Questions
State the reason for the following:
$(a)$ The elements of the same group have similar chemical properties.
$(b)$ The elements of the same period have different properties.
$(a)$ The elements of the same group have similar chemical properties.
$(b)$ The elements of the same period have different properties.
Easy
View SolutionIn Mendeleev's Periodic Table,the elements were arranged in the increasing order of their atomic masses. However,cobalt with an atomic mass of $58.93 \ amu$ was placed before nickel having an atomic mass of $58.71 \ amu$. Give the reason for the same.
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View SolutionTaking the example of an element of atomic number $16$, explain how the electronic configuration of the atom of an element relates to its position in the modern periodic table and how valency of an element is calculated on the basis of its atomic number.
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View SolutionWhich of the following is the outermost shell for elements of period $2$?
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View SolutionWrite the formulae of chlorides of Eka-silicon and Eka-aluminium,the elements predicted by Mendeleev.
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