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Earn 100
-aluminium and -silicon are known as -
40% studentsanswered this correctly
Important Questions on Classification of Elements and Periodicity in Properties
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Mendeleev's periodic law states that the properties of elements are a periodic function of their
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Henry Moseley studied characteristic -ray spectra of elements. The graph which represents his observation correctly is
Given Frequency of X-ray emitted
Atomic number
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The neutral oxide among the following is
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It is observed that characteristic X-ray spectra of elements show regularity. When frequency to the power 'n' i.e. of X-rays emitted is plotted against atomic number , the following graph is obtained.
The value of 'n' is
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Which one of the following statements for D.I. Mendeleev, is incorrect ?
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The atomic number of the element unnilennium is :
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Which of the following is a metalloid?
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In which of the following options, the law of triad is applicable?
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Which of the given atoms has the greatest electron affinity?
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Identify the incorrect match.
| Name IUPAC | Official Name |
| (a) Unnilunium | (i) Mendelevium |
| (b) Unniltrium | (ii) Lawrencium |
| (c) Unnilhexium | (iii) Seaborgium |
| (d) Unununium | (iv) Darmstadtium |
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Which one of the following element is represented as Eka-Silicon in Mendeleev's periodic table?
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Periodic classification of elements based on atomic volume curve was given by
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Lother Meyer obtained the curve for the known elements by plotting their atomic volumes against
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Mendeleef's Periodic Table is upset by the fact that
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Mendeleev's periodic table is based on atomic masses of elements. It was the first successful attempt to classify all the known elements (63) that time. One of the most importance advantage of this classification was that Mandeleev predicated the physical and chemical properties of three elements: Eka - boron, Eka - silicon and Eka - aluminium. These elements were discovered as
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In Lother Meyer plot, the peaks are occupied by
HARD
Match the following
| List – I | List – II |
| A) Rubedium | I) Germanium |
| B) Platinum | II) Radio active chalcogen |
| C) Ekasilicon | III) S-block element |
| D) Polonium | IV) Atomic number 78 |
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How many elements were known when Mendeleev presented the periodic table ?
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What is the basic difference in approach between the Mendeleev’s Periodic Law and the Modern Periodic Law?
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Mendeleef's Periodic Table is upset by the fact that
