John Alexander Newlands proposed the 'Law of Octaves' in 1865. He observed that when elements were arranged in order of increasing atomic weight, the properties of every eighth element showed similarities to the first, like the eighth note in an octave of music.
English
80 Questions
160 Marks
60 Mins English English20 Questions40 Marks12 Mins English English80 Questions160 Marks60 Mins EnglishWhich of the following is NOT a Döbereiner’s triad?
In which of two groups of elements have highly negative electron gain enthalpies and readily add one or two electrons respectively to attain the stable noble gas configuration?
Which of the following elements is classified as a lanthanoid group element?
Given below are two statements:
Statement I: The period number in the long form of the periodic table is equal to magnetic quantum number of any element of the period.
Statement II: The period number in the long form of the periodic table is equal to maximum principal quantum number of any element of the period.
In the light of the above statements, choose the correct answer from the options given below:
Which of the following elements is calssified as an actinoid group element?
Which group did iodine belong to in Mendeleev’s table?
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