Class 10SciencePeriodic Classification of ElementsMix Examples - Periodic Classification of Elements
MediumAn element $X$ (atomic number $17$) reacts with an element $Y$ (atomic number $20$) to form a divalent halide.
$(a)$ Where in the periodic table are elements $X$ and $Y$ placed?
$(b)$ Classify $X$ and $Y$ as metal$(s)$,non-metal$(s)$,or metalloid$(s)$.
$(a)$ Where in the periodic table are elements $X$ and $Y$ placed?
$(b)$ Classify $X$ and $Y$ as metal$(s)$,non-metal$(s)$,or metalloid$(s)$.
(A-D) The electronic configuration of element $X$ $(Z=17)$ is $2, 8, 7$. Since it has $7$ valence electrons,it belongs to Group $17$ and the $3^{rd}$ period.
The electronic configuration of element $Y$ $(Z=20)$ is $2, 8, 8, 2$. Since it has $2$ valence electrons,it belongs to Group $2$ and the $4^{th}$ period.
$(b)$ Element $X$ is a non-metal because it gains electrons to complete its octet. Element $Y$ is a metal because it loses $2$ electrons to form a stable cation.
The electronic configuration of element $Y$ $(Z=20)$ is $2, 8, 8, 2$. Since it has $2$ valence electrons,it belongs to Group $2$ and the $4^{th}$ period.
$(b)$ Element $X$ is a non-metal because it gains electrons to complete its octet. Element $Y$ is a metal because it loses $2$ electrons to form a stable cation.
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Similar Questions
Arrange the following elements in the order of their increasing non-metallic character: $Li, O, C, Be, F$.
Medium
View SolutionAtomic 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?
Medium
View SolutionGive reasons for the following:
$(a)$ Lithium atom is smaller than Sodium atom.
$(b)$ Chlorine (Atomic Number $17$) is more electronegative than Sulphur (Atomic Number $16$).
$(a)$ Lithium atom is smaller than Sodium atom.
$(b)$ Chlorine (Atomic Number $17$) is more electronegative than Sulphur (Atomic Number $16$).
Medium
View SolutionThree elements $X$,$Y$,and $Z$ having atomic numbers $11$,$7$,and $6$ respectively react with oxygen to form their oxides.
$(a)$ Arrange these oxides in increasing order of their basic nature.
$(b)$ Give reason for your answer.
$(a)$ Arrange these oxides in increasing order of their basic nature.
$(b)$ Give reason for your answer.
Medium
View Solution$(i)$ State Modern Periodic Law.
$(ii)$ How many :
$(a)$ groups and
$(b)$ periods are present in the modern periodic table?
$(iii)$ State how the problem of placing:
$(a)$ hydrogen,
$(b)$ isotopes of an element has been solved in this periodic table.
$(ii)$ How many :
$(a)$ groups and
$(b)$ periods are present in the modern periodic table?
$(iii)$ State how the problem of placing:
$(a)$ hydrogen,
$(b)$ isotopes of an element has been solved in this periodic table.
Medium
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