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NEET UG Classification of Elements — practice questions — page 2

Explore 108 free Classification of Elements questions in NEET UG Chemistry. Open each question or exercise to read its content, reference answers and available explanation.

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Classification of Elements questions and exercises with answers

Showing questions 31–60 of 108.

Who proposed the Law of Triads in 1829?Read the answer and worked solution →Newlands' Law of Octaves held good only for elements up to which element?Read the answer and worked solution →Newlands was later honoured for his Law of Octaves with which award in 1887?Read the answer and worked solution →Which chemist plotted atomic volume against atomic weight and found a repeating pattern in 1869?Read the answer and worked solution →Mendeleev placed iodine in the halogen group despite its lower atomic weight than which element?Read the answer and worked solution →Mendeleev's predicted element eka-aluminium was later discovered as which element?Read the answer and worked solution →Eka-silicon, predicted by Mendeleev, is the element now called what?Read the answer and worked solution →Moseley's 1913 X-ray spectra work showed which property to be more fundamental than atomic mass?Read the answer and worked solution →The Modern Periodic Law relates the properties of elements periodically to their what?Read the answer and worked solution →Neptunium and plutonium occur naturally in pitchblende, an ore of which metal?Read the answer and worked solution →What name is given to the horizontal rows of elements in the long form periodic arrangement?Read the answer and worked solution →How many periods does the modern long form arrangement of elements have?Read the answer and worked solution →A period number equals which quantity?Read the answer and worked solution →How many elements does the fourth period contain?Read the answer and worked solution →Which period contains 32 elements?Read the answer and worked solution →The fifth period has 18 elements because its filling orbitals total how many?Read the answer and worked solution →In which order do the 5s, 4d and 5p orbitals increase in energy?Read the answer and worked solution →Under the 1984 IUPAC recommendation, the element groups are numbered how?Read the answer and worked solution →Whose work on transuranium elements led to placing the actinoids below the lanthanoids?Read the answer and worked solution →Element 104 was named Rutherfordium by Americans but by Soviet scientists it was called what?Read the answer and worked solution →Which IUPAC systematic name belongs to the element with atomic number 101?Read the answer and worked solution →Element 104 has which IUPAC systematic name?Read the answer and worked solution →What is the three-letter temporary symbol for element 112?Read the answer and worked solution →In IUPAC systematic naming, the numerical root used for the digit 0 is what?Read the answer and worked solution →An undiscovered element with Z = 117 would belong to which group?Read the answer and worked solution →Element 120 would be expected to belong to which family?Read the answer and worked solution →Which block of elements is defined by the filling of ns orbitals only, as in groups 1 and 2?Read the answer and worked solution →Helium is strictly an s-block element, yet it is placed with which group?Read the answer and worked solution →Hydrogen is placed separately because it can resemble both alkali metals and which family?Read the answer and worked solution →Compounds of s-block elements are mostly ionic, with the exception of those of which pair?Read the answer and worked solution →

Worked practice questions

Who proposed the Law of Triads in 1829?

  1. Henry Moseley
  2. Lothar Meyer
  3. Johann Dobereiner
  4. John Newlands
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Correct answer: C. Johann Dobereiner

Dobereiner's Law of Triads described sets of three elements whose middle member had an atomic weight about halfway between the other two.

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Newlands' Law of Octaves held good only for elements up to which element?

  1. Iron
  2. Argon
  3. Potassium
  4. Calcium
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Correct answer: D. Calcium

Beyond calcium the every-eighth-element pattern of Newlands broke down, so the law worked only for lighter elements.

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Newlands was later honoured for his Law of Octaves with which award in 1887?

  1. Faraday Medal
  2. Nobel Prize
  3. Davy Medal
  4. Copley Medal
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Correct answer: C. Davy Medal

The Royal Society awarded Newlands the Davy Medal in 1887, long after his octave idea was first dismissed.

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