EASY
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Which of the following element have maximum atomic volume?
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Important Questions on Classification of Elements and Periodicity in Properties
MEDIUM
The neutral oxide among the following is
EASY
Identify the incorrect match.
| Name IUPAC | Official Name |
| (a) Unnilunium | (i) Mendelevium |
| (b) Unniltrium | (ii) Lawrencium |
| (c) Unnilhexium | (iii) Seaborgium |
| (d) Unununium | (iv) Darmstadtium |
MEDIUM
Henry Moseley studied characteristic -ray spectra of elements. The graph which represents his observation correctly is
Given Frequency of X-ray emitted
Atomic number
EASY
The atomic number of the element unnilennium is :
MEDIUM
Which of the given atoms has the greatest electron affinity?
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Which one of the following element is represented as Eka-Silicon in Mendeleev's periodic table?
MEDIUM
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
EASY
Which of the following is a metalloid?
MEDIUM
In which of the following options, the law of triad is applicable?
MEDIUM
Which one of the following statements for D.I. Mendeleev, is incorrect ?
EASY
Mendeleev's periodic law states that the properties of elements are a periodic function of their
MEDIUM
The law of triads is applicable to:
EASY
Who presented the law of octave?
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Eka-aluminium and Eka-silicon are known as -
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How many elements were known when Mendeleeff presented the periodic table ?
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Lother Meyer obtained the curve for the known elements by plotting their atomic volumes against
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Dobereiner's law of triads is not applicable to
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Which scientist is not associated with the development of the periodic table?
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The atomic masses of and are 7 and 39, respectively. According to law of triads the atomic mass of will be
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The law of triad is applicable to a group of
