Class 10SciencePeriodic Classification of ElementsMix Examples - Periodic Classification of Elements
MediumGiven below are some elements of the modern periodic table. Atomic numbers of the elements are given in the parentheses: $A(4), B(9), C(14), D(19), E(20)$.
$(a)$ Select the element that has one electron in the outermost shell. Also,write the electronic configuration of this element.
$(b)$ Which two elements amongst these belong to the same group? Give reason for your answer.
$(c)$ Which two elements amongst these belong to the same period? Which one of the two has a bigger atomic radius?
$(a)$ Select the element that has one electron in the outermost shell. Also,write the electronic configuration of this element.
$(b)$ Which two elements amongst these belong to the same group? Give reason for your answer.
$(c)$ Which two elements amongst these belong to the same period? Which one of the two has a bigger atomic radius?
(D) The element with one electron in the outermost shell is $D$ (atomic number $19$). Its electronic configuration is $2, 8, 8, 1$.
$(b)$ Elements $A$ (atomic number $4$,configuration $2, 2$) and $E$ (atomic number $20$,configuration $2, 8, 8, 2$) belong to the same group because both have $2$ valence electrons in their outermost shell.
$(c)$ Elements $D$ (atomic number $19$,period $4$) and $E$ (atomic number $20$,period $4$) belong to the same period. Between $D$ and $E$,$D$ has a bigger atomic radius because atomic radius decreases across a period from left to right due to an increase in nuclear charge.
$(b)$ Elements $A$ (atomic number $4$,configuration $2, 2$) and $E$ (atomic number $20$,configuration $2, 8, 8, 2$) belong to the same group because both have $2$ valence electrons in their outermost shell.
$(c)$ Elements $D$ (atomic number $19$,period $4$) and $E$ (atomic number $20$,period $4$) belong to the same period. Between $D$ and $E$,$D$ has a bigger atomic radius because atomic radius decreases across a period from left to right due to an increase in nuclear charge.
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Similar Questions
Given below are four elements with their atomic numbers:
Element Atomic Number $A$ $16$ $B$ $11$ $C$ $3$ $D$ $14$
$(a)$ Identify the elements which belong to the same group of the Modern Periodic Table.
$(b)$ Arrange the given elements in decreasing order of atomic size.
$(c)$ Write the formula of the oxide of $B$.
$(d)$ Which of the above elements is a metalloid?
| Element | Atomic Number |
|---|---|
| $A$ | $16$ |
| $B$ | $11$ |
| $C$ | $3$ |
| $D$ | $14$ |
$(a)$ Identify the elements which belong to the same group of the Modern Periodic Table.
$(b)$ Arrange the given elements in decreasing order of atomic size.
$(c)$ Write the formula of the oxide of $B$.
$(d)$ Which of the above elements is a metalloid?
Medium
View SolutionProperties of the elements are given below. Where would you locate the following elements in the periodic table?
$(a)$ $A$ soft metal stored under kerosene.
$(b)$ An element with variable (more than one) valency stored under water.
$(c)$ An element which is tetravalent and forms the basis of organic chemistry.
$(a)$ $A$ soft metal stored under kerosene.
$(b)$ An element with variable (more than one) valency stored under water.
$(c)$ An element which is tetravalent and forms the basis of organic chemistry.
Difficult
View SolutionAn element $X$ belongs to the $3rd$ period and group $16$ of the Modern Periodic Table.
$(a)$ Determine the number of valence electrons and the valency of $X$.
$(b)$ Write the molecular formula of the compound formed when $X$ reacts with hydrogen and draw its electron dot structure.
$(c)$ Name the element $X$ and state whether it is metallic or non-metallic.
$(a)$ Determine the number of valence electrons and the valency of $X$.
$(b)$ Write the molecular formula of the compound formed when $X$ reacts with hydrogen and draw its electron dot structure.
$(c)$ Name the element $X$ and state whether it is metallic or non-metallic.
Medium
View SolutionThe position of some elements $A, B, C, D, E, F$ and $G$ in the Modern Periodic Table is given as under:
Group $\to$ $16$ $17$ $18$ Period $1$ $A$ Period $2$ $B$ $C$ $D$ Period $3$ $E$ $F$ $G$
$(a)$ In which group are inert elements placed?
$(b)$ What type of ions would $B, C, E,$ and $F$ form?
$(c)$ Which element would have chemical properties similar to $C$?
$(d)$ How many shells would $A$ have?
$(e)$ What is the similarity between $A$ and $D$?
$(f)$ Identify the most abundant element in the earth's crust.
| Group $\to$ | $16$ | $17$ | $18$ |
| Period $1$ | $A$ | ||
| Period $2$ | $B$ | $C$ | $D$ |
| Period $3$ | $E$ | $F$ | $G$ |
$(a)$ In which group are inert elements placed?
$(b)$ What type of ions would $B, C, E,$ and $F$ form?
$(c)$ Which element would have chemical properties similar to $C$?
$(d)$ How many shells would $A$ have?
$(e)$ What is the similarity between $A$ and $D$?
$(f)$ Identify the most abundant element in the earth's crust.
Medium
View SolutionStudy the following table in which positions of six elements $A, B, C, D, E$ and $F$ are shown as they are in the modern periodic table:
Group $\to$ $1$ $2$ $13$ $14$ $15$ $16$ $17$ $18$ Period $2$ $A$ - - - $B$ - - $C$ Period $3$ - - $D$ $E$ - - - $F$
On the basis of the above table,answer the following questions:
$(i)$ Name the element which forms only covalent compounds.
$(ii)$ Name the element which is a metal with valency three.
$(iii)$ Name the element which is a non-metal with valency three.
$(iv)$ Out of $D$ and $E$,which is bigger in size and why?
$(v)$ Write the common name for the family to which the elements $C$ and $F$ belong.
| Group $\to$ | $1$ | $2$ | $13$ | $14$ | $15$ | $16$ | $17$ | $18$ |
| Period $2$ | $A$ | - | - | - | $B$ | - | - | $C$ |
| Period $3$ | - | - | $D$ | $E$ | - | - | - | $F$ |
On the basis of the above table,answer the following questions:
$(i)$ Name the element which forms only covalent compounds.
$(ii)$ Name the element which is a metal with valency three.
$(iii)$ Name the element which is a non-metal with valency three.
$(iv)$ Out of $D$ and $E$,which is bigger in size and why?
$(v)$ Write the common name for the family to which the elements $C$ and $F$ belong.
Difficult
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