Class 10SciencePeriodic Classification of ElementsMix Examples - Periodic Classification of Elements
MediumAn 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.
(N/A) The electronic configuration of $X$ is $2, 8, 6$.
Number of valence electrons $= 6$.
Valency $= 8 - 6 = 2$.
$(b)$ When $X$ reacts with hydrogen,it forms a compound with the molecular formula $H_2X$. Since $X$ is Sulphur,the formula is $H_2S$. The electron dot structure is shown in the image provided.
$(c)$ The element $X$ is Sulphur $(S)$. It is a non-metal.
Number of valence electrons $= 6$.
Valency $= 8 - 6 = 2$.
$(b)$ When $X$ reacts with hydrogen,it forms a compound with the molecular formula $H_2X$. Since $X$ is Sulphur,the formula is $H_2S$. The electron dot structure is shown in the image provided.
$(c)$ The element $X$ is Sulphur $(S)$. It is a non-metal.
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Similar Questions
Properties of the elements are given below. Where would you locate the following elements in the periodic table?
$(a)$ An element which is an inert gas with atomic number $2$.
$(b)$ An element whose thin oxide layer is used to make other elements corrosion resistant by the process of 'anodising'.
$(a)$ An element which is an inert gas with atomic number $2$.
$(b)$ An element whose thin oxide layer is used to make other elements corrosion resistant by the process of 'anodising'.
Medium
View Solution$(a)$ In this ladder (Figure),symbols of elements are jumbled up. Rearrange these symbols of elements in the increasing order of their atomic number in the Periodic Table.
$(b)$ Arrange them in the order of their group also.
$(b)$ Arrange them in the order of their group also.
Difficult
View SolutionGiven 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 SolutionAn element is placed in $2^{nd}$ Group and $3^{rd}$ Period of the Periodic Table. It burns in the presence of oxygen to form a basic oxide.
$(a)$ Write a balanced chemical equation when this oxide is dissolved in water.
$(b)$ Draw the electron dot structure for the formation of this oxide.
$(a)$ Write a balanced chemical equation when this oxide is dissolved in water.
$(b)$ Draw the electron dot structure for the formation of this oxide.
Medium
View SolutionThe atomic numbers of a few elements are given below: $10, 20, 7, 14$.
$(a)$ Identify the elements.
$(b)$ Identify the group number of these elements in the Periodic Table.
$(c)$ Identify the periods of these elements in the Periodic Table.
$(a)$ Identify the elements.
$(b)$ Identify the group number of these elements in the Periodic Table.
$(c)$ Identify the periods of these elements in the Periodic Table.
Medium
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