Class 10SciencePeriodic Classification of ElementsMix Examples - Periodic Classification of Elements
MediumAtomic numbers of a few elements are given below: $10, 20, 7, 14$.
$(a)$ What would be the electronic configuration for each of these elements?
$(b)$ Determine the valency of these elements.
$(a)$ What would be the electronic configuration for each of these elements?
$(b)$ Determine the valency of these elements.
(N/A) Electronic configuration:
- For atomic number $10$ (Neon): $(2, 8)$
- For atomic number $20$ (Calcium): $(2, 8, 8, 2)$
- For atomic number $7$ (Nitrogen): $(2, 5)$
- For atomic number $14$ (Silicon): $(2, 8, 4)$
$(b)$ Valency:
- For $10$ (Neon): Valence electrons = $8$,so valency = $8 - 8 = 0$ (Inert gas).
- For $20$ (Calcium): Valence electrons = $2$,so valency = $2$.
- For $7$ (Nitrogen): Valence electrons = $5$,so valency = $8 - 5 = 3$.
- For $14$ (Silicon): Valence electrons = $4$,so valency = $4$.
- For atomic number $10$ (Neon): $(2, 8)$
- For atomic number $20$ (Calcium): $(2, 8, 8, 2)$
- For atomic number $7$ (Nitrogen): $(2, 5)$
- For atomic number $14$ (Silicon): $(2, 8, 4)$
$(b)$ Valency:
- For $10$ (Neon): Valence electrons = $8$,so valency = $8 - 8 = 0$ (Inert gas).
- For $20$ (Calcium): Valence electrons = $2$,so valency = $2$.
- For $7$ (Nitrogen): Valence electrons = $5$,so valency = $8 - 5 = 3$.
- For $14$ (Silicon): Valence electrons = $4$,so valency = $4$.
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Three elements $X$,$Y$,and $Z$ have atomic numbers $7$,$8$,and $9$ respectively.
$(a)$ State their positions (Group number and period number both) in the Modern Periodic Table.
$(b)$ Arrange these elements in the decreasing order of their atomic radii.
$(c)$ Write the formula of the compound formed when $X$ combines with $Z$.
$(a)$ State their positions (Group number and period number both) in the Modern Periodic Table.
$(b)$ Arrange these elements in the decreasing order of their atomic radii.
$(c)$ Write the formula of the compound formed when $X$ combines with $Z$.
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$(a)$ 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.
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$(a)$ $X$ has $12$ protons and $12$ electrons.
$(b)$ $Y$ has $12$ protons and $10$ electrons.
$(a)$ $X$ has $12$ protons and $12$ electrons.
$(b)$ $Y$ has $12$ protons and $10$ electrons.
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$(a)$ $A$ 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.
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