Class 10SciencePeriodic Classification of ElementsMix Examples - Periodic Classification of Elements
EasyState whether the following statement is true or false: In $1913$,Dmitri Ivanovich Mendeleev showed that the atomic number of an element is a more fundamental property than its atomic mass.
(FALSE) The statement is False. It was Henry Moseley,not Dmitri Ivanovich Mendeleev,who demonstrated in $1913$ that the atomic number of an element is a more fundamental property than its atomic mass. Mendeleev's periodic law was based on atomic mass.
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Similar Questions
Which of the following elements would form anions? Why?
$(i)$ $Na$ $(ii)$ $O$ $(iii)$ $Mg$ $(iv)$ $Al$ $(v)$ $Cl$
$(i)$ $Na$ $(ii)$ $O$ $(iii)$ $Mg$ $(iv)$ $Al$ $(v)$ $Cl$
Medium
View SolutionName the following:
$(a)$ $A$ metal that can be cut with a knife.
$(b)$ $A$ metal that is liquid at room temperature.
$(c)$ $A$ metal that has $3$ valence electrons.
$(a)$ $A$ metal that can be cut with a knife.
$(b)$ $A$ metal that is liquid at room temperature.
$(c)$ $A$ metal that has $3$ valence electrons.
Medium
View SolutionThe atomic number of an element is $17$. Predict $(a)$ its valency,$(b)$ whether it is a metal or non-metal,$(c)$ its relative size with respect to other members of its group. Justify your answer in each case.
Medium
View SolutionGive two reasons to explain how the metallic character of elements varies: $(a)$ in a group,$(b)$ in a period.
Medium
View SolutionThe scientist who showed that the atomic number of an element is a more fundamental property than its atomic mass is:
Easy
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