Tag: newland's law of octaves

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Multiple choice chemistry the periodic table newland's law of octaves development of the modern periodic table into the history

X and Y are two elements having similar properties which obey Newlands law of octaves. The number of elements in between X and Y respectively are:

  1. 8

  2. 6

  3. 7

  4. 9
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Newlands' law of octaves states that every eighth element has properties similar to the first. If X is the first element, the eighth element is Y. The number of elements between them is 8 - 1 - 1 = 6.

Multiple choice chemistry the periodic table newland's law of octaves development of the modern periodic table into the history

The Newland's law of octaves for the classification of elements was found to be applicable only up to the element ______________________.

  1. potassium

  2. calcium

  3. cobalt

  4. phosphorous
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The Newland's law of octaves for the classification of elements was found to be applicable only up to the element calcium.


Law of octaves, in chemistry, the generalization made by the English chemist J.A.R. Newlands in 1865 that, if the chemical elements are arranged according to increasing atomic weight, those with similar physical and chemical properties occur after each interval of seven elements.

 Newlands was one of the first to detect a periodic pattern in the properties of the elements and anticipated later developments of the periodic law.

Multiple choice chemistry the periodic table newland's law of octaves development of the modern periodic table into the history

The elements $A$ and $B$ obey Newland's law of octave. How many elements are there between $A$ and $B$?

  1. 7

  2. 8

  3. 5

  4. 6
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

According to the law of octaves, those with similar physical and chemical properties occur after each interval of seven. 


Thus if $A$ is the first element and $B$ is the eighth element, the number of elements in between $A$ and $B$ is 6.

Hence, option D is correct.

Multiple choice chemistry the periodic table newland's law of octaves development of the modern periodic table into the history

John Newlands arranged the known elements in a/an  ______ order of their atomic _______ .

  1. increasing, masses

  2. decreasing, masses

  3. increasing, numbers

  4. decreasing, numbers
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

John Newlands arranged the known elements in an increasing order of their atomic masses. He started with the element having the lowest atomic mass ( hydrogen ) and ended at thorium which was the $56^{th}$ element. Some of the elements satisfying this order are arranged as $H, Li, Be, B, C, N, O$.

Multiple choice chemistry the periodic table newland's law of octaves development of the modern periodic table into the history
The given arranged sequence on the basis of their increasing atomic masses represents which law of classification of elements?  

$F, Na, Mg, Al, Si, P, S, Cl$ & $K$

  1. Modern table

  2. Newton's law

  3. Newland's law of octaves

  4. Mendeleev's periodic table
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Elements have been arranged in the following sequence on the basis of their increasing atomic masses.

    $F, Na, Mg, Al, Si, P, S, Cl$ & $K$

Law of octaves is given by the English chemist J.A.R. Newlands in 1865.
It states that if chemical elements are arranged according to increasing atomic weight, similar physical and chemical properties occur after each interval of seven elements.

Newlands was the first to detect a periodic pattern in the properties of the elements and anticipated later developments of the periodic law.

Multiple choice chemistry the periodic table newland's law of octaves development of the modern periodic table into the history

For which of the pair Newland octave rule is not applicable?

  1. $Li,\ Na$
  2. $C,\ Si$
  3. $Mg,\ Ca$
  4. $Cl,\ Br$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

According to Newland Octave law, when elements are arranged in increasing atomic mass every eighth element has similar properties to the first element.

Further the law was not applicable to elements of higher atomic masses. So, law was applicable till calcium.
Hence, $Cl,Br$ is not applicable to Newland Octave Rule.

Multiple choice chemistry the periodic table newland's law of octaves development of the modern periodic table into the history

Who presented the law of octave? 

  1. Dobereiner

  2. Newland

  3. Lother Meyer

  4. Mendeleev
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation
According to Newland's law of octaves, when elements are arranged by increasing atomic mass, the properties of every eighth element starting from any element are a repetition of the properties of the starting element.
Option B is correct.