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The Newlands' Law of Octaves was applicable only for elements up to magnesium.

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Important Questions on Periodicity

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Which one of the following element is represented as Eka-Silicon in Mendeleev's periodic table?
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Which of the given atoms has the greatest electron affinity?
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Mendeleev's periodic law states that the properties of elements are a periodic function of their
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Which one of the following statements for D.I. Mendeleev, is incorrect ?
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In which of the following options, the law of triad is applicable?
HARD
What was the need for classification of elements?
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Which of the following set of elements are not in accordance with the Law of Octave rule?
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Which of the following is not a Dobereiner triad?
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The law of triad is applicable to a group of
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Represent the union of two sets by Venn diagram for each of the following.

X={x | x is a prime number between 80 and 100}

Y={y | y is an odd number between 90 and 100}

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In graph of atomic volume versus atomic weight, the elements corresponding to peaks in the curve belong to:-
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Atomic mass of Cl=35.5u and that of I=127u. According to Dobereiner's triad rule, atomic mass of Br will be________u.

Round off your answer to the nearest integer.

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Dobereiner's law of triads is not applicable to

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Identify the term or substance based on the description given below.
The law where every 8th element repeats properties.
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Lother Meyer obtained the curve for the known elements by plotting their atomic volumes against
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The atomic masses of Li and K are 7 and 39, respectively. According to law of triads the atomic mass of Na will be
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In the long form of periodic table, elements are arranged according to -
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From the following elements, select the elements which forms the Dobereiner’s triad.
F, Mg, Ca, Br, Li, K, Rb, Cl, Sr, I