Class 10SciencePeriodic Classification of ElementsMix Examples - Periodic Classification of Elements
Medium$(a)$ Why do we classify elements?
$(b)$ What were the two criteria used by Mendeleev in creating his Periodic Table?
$(c)$ Why did Mendeleev leave some gaps in his Periodic Table?
$(d)$ In Mendeleev's Periodic Table,why was there no mention of noble gases like Helium,Neon,and Argon?
$(e)$ Would you place the two isotopes of chlorine,$Cl-35$ and $Cl-37$,in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.
$(b)$ What were the two criteria used by Mendeleev in creating his Periodic Table?
$(c)$ Why did Mendeleev leave some gaps in his Periodic Table?
$(d)$ In Mendeleev's Periodic Table,why was there no mention of noble gases like Helium,Neon,and Argon?
$(e)$ Would you place the two isotopes of chlorine,$Cl-35$ and $Cl-37$,in different slots because of their different atomic masses or in the same slot because their chemical properties are the same? Justify your answer.
(N/A) Classification of elements helps in:
$(i)$ Systematic study of the properties of elements.
$(ii)$ Making it easier to understand and remember the properties of elements.
$(b)$ The two criteria used by Mendeleev were:
$(i)$ Increasing order of atomic mass.
$(ii)$ Similarity in the chemical properties of the elements.
$(c)$ Mendeleev left gaps in his periodic table for elements that were yet to be discovered,such as gallium and germanium.
$(d)$ There was no mention of noble gases like helium,neon,and argon because they were not known at that time and were discovered much later.
$(e)$ According to Mendeleev's periodic table,$Cl-35$ and $Cl-37$ should be placed in different positions because the basis of classification was the increasing order of atomic masses. However,since their chemical properties are identical,they are placed in the same position in the modern periodic table,which is based on atomic number.
$(i)$ Systematic study of the properties of elements.
$(ii)$ Making it easier to understand and remember the properties of elements.
$(b)$ The two criteria used by Mendeleev were:
$(i)$ Increasing order of atomic mass.
$(ii)$ Similarity in the chemical properties of the elements.
$(c)$ Mendeleev left gaps in his periodic table for elements that were yet to be discovered,such as gallium and germanium.
$(d)$ There was no mention of noble gases like helium,neon,and argon because they were not known at that time and were discovered much later.
$(e)$ According to Mendeleev's periodic table,$Cl-35$ and $Cl-37$ should be placed in different positions because the basis of classification was the increasing order of atomic masses. However,since their chemical properties are identical,they are placed in the same position in the modern periodic table,which is based on atomic number.
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Write true or false for the statement: Electronic configuration of hydrogen resembles that of alkaline earth metals.
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View SolutionWhich of the following statement$(s)$ about the Modern Periodic Table are incorrect?
$(i)$ The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number.
$(ii)$ The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses.
$(iii)$ Isotopes are placed in adjoining group$(s)$ in the Periodic Table.
$(iv)$ The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number.
$(i)$ The elements in the Modern Periodic Table are arranged on the basis of their decreasing atomic number.
$(ii)$ The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic masses.
$(iii)$ Isotopes are placed in adjoining group$(s)$ in the Periodic Table.
$(iv)$ The elements in the Modern Periodic Table are arranged on the basis of their increasing atomic number.
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View SolutionWhich of the following elements would form anions? Why?
$(i)$ $Na$ $(ii)$ $O$ $(iii)$ $Mg$ $(iv)$ $Al$ $(v)$ $Cl$
$(i)$ $Na$ $(ii)$ $O$ $(iii)$ $Mg$ $(iv)$ $Al$ $(v)$ $Cl$
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View SolutionThe following table shows elements represented by the letters $A, B, C, D, E, F, G$ and $H$.
Group $1$ $2$ $13$ $14$ $15$ $16$ $17$ $18$ Element $A$ $B$ $C$ $D$ $E$ $F$ $G$ $H$
$(i)$ Which of the elements has the atomic size:
$(a)$ biggest and $(b)$ smallest?
$(ii)$ Which element has valency:
$(a)$ $3$ and $(b)$ zero?
| Group | $1$ | $2$ | $13$ | $14$ | $15$ | $16$ | $17$ | $18$ |
| Element | $A$ | $B$ | $C$ | $D$ | $E$ | $F$ | $G$ | $H$ |
$(i)$ Which of the elements has the atomic size:
$(a)$ biggest and $(b)$ smallest?
$(ii)$ Which element has valency:
$(a)$ $3$ and $(b)$ zero?
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View SolutionThe electrons in the atoms of four elements $A, B, C$ and $D$ are distributed in three shells having $1, 3, 5$ and $7$ electrons in the outermost shell respectively. State the period in which these elements can be placed in the modern periodic table. Write the electronic configuration of the atoms of $A$ and $D$ and the molecular formula of the compound formed when $A$ and $D$ combine.
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