Practice free Classification of elements and Periodicity in properties (Chemistry) NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
What is the numerical root for the digit '0' in IUPAC nomenclature for elements with Z > 100?
According to Table 3.4 'Notation for IUPAC nomenclature of Elements', the numerical root for the digit '0' is 'nil'.
Which of the following scientists first considered the idea of trends among properties of elements in the early 1800s?
The context states: 'The German chemist, Johann Dobereiner in early 1800’s was the first to consider the idea of trends among properties of elements.'
Dobereiner's Triads demonstrated that the atomic weight of the middle element in a triad was approximately:
According to the context: 'In each case, he noticed that the middle element of each of the triads had an atomic weight about halfway between the atomic weights of the other two' (Table 3.1 also exemplifies this).
Newlands's Law of Octaves was applicable primarily for elements up to which element?
The text mentions: 'Newlands’s Law of Octaves seemed to be true only for elements up to calcium.'
The Modern Periodic Law states that the physical and chemical properties of elements are periodic functions of their:
The context clearly defines the Modern Periodic Law: 'The physical and chemical properties of the elements are periodic functions of their atomic numbers.'
Who experimentally demonstrated that atomic number is a more fundamental property of an element than its atomic mass, leading to the modification of Mendeleev's Periodic Law?
The passage states: 'In 1913, the English physicist, Henry Moseley observed regularities in the characteristic X-ray spectra of the elements... He thereby showed that the atomic number is a more fundamental property of an element than its atomic mass.'
The Periodic Law, as it is understood today, is fundamentally a consequence of the periodic variation in:
The text says: 'In fact, it is now recognized that the Periodic Law is essentially the consequence of the periodic variation in electronic configurations, which indeed determine the physical and chemical properties of elements and their compounds.'
In 1800, approximately how many elements were known?
The context states: 'In 1800, only 31 elements were known.'
By 1865, the number of identified elements had approximately doubled to:
The text mentions: 'By 1865, the number of identified elements had more than doubled to 63.'
Moseley's work involved plotting $\sqrt{\nu}$ (where $\nu$ is the frequency of X-rays emitted) against which atomic property, yielding a straight line?
The context states: 'A plot of $\sqrt{\nu}$ (where $\nu$ is frequency of X-rays emitted) against atomic number (Z) gave a straight line and not the plot of $\sqrt{\nu}$ vs atomic mass.'
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