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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Predict the maximum number of valence electrons possible for atoms in the first period of the periodic table.
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View SolutionIn Mendeleev's Periodic Table,gaps were left for elements to be discovered later. Which of the following elements found a place in the periodic table later?
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View SolutionOn moving from left to right in a period in the periodic table,the size of the atom.
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View SolutionThe element with atomic number $14$ is hard and forms acidic oxide and a covalent halide. To which of the following categories does the element belong?
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View SolutionAn element $X$ has a mass number of $35$ and the number of neutrons is $18$. Determine the atomic number and electronic configuration of $X$. Also, identify the group number, period number, and valency of $X$.
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