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

Law of octaves stated :

  1. every eighth element had properties similar to the first element

  2. every third element had properties similar to the first element

  3. the properties of the middle element were in between the other two members

  4. the properties of the elements were repeated after regular intervals of 3,4 or 8 elements
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Newland's Law of octaves stated that if elements (known at Newland's time) were arranged in increasing order of their atomic weights, every eighth element had properties similar to the first element. For example, Li and Na have similar properties.

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

What were the limitations of Newlands' classification?

  1. It was applicable only for lighter elements

  2. He adjusted two elements on the same place

  3. The pattern was only observed up to calcium

  4. All of the above
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The limitations of Newlands' classification were:

  • It was only applicable for lighter elements.
  • He adjusted two elements in one place.
  • The pattern was only observed up to calcium.

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

The placement of elements in the Newlands' table was compared to :

  1. weeks of a month

  2. notes of music

  3. months of a year

  4. days of a month
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

The placement of elements in the Newlands' periodic table was compared to the notes of music where the first note and the eighth note are same. Similarly, in Newlands' periodic table, the chemical properties also repeat after $7$ elements.

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

If X and Y are two elements which belong to same group of Newland's periodic table, how many elements exists between X and Y?

  1. $4$
  2. $5$
  3. $6$
  4. $7$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

In Newland's periodic table, $1$st element and the $8$th element have the same chemical property, i.e., they belong to the same group. So, the table will look like:
$\begin{equation}X\;1\;2\;3\;4\;5\;6 \ Y\end{equation}$
So, there are $6$ elements between X and Y.

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

Dobereiner grouped the elements into triads and Newland gave the:

  1. law of Octaves

  2. mass number

  3. atomic number

  4. valency
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

In 1864 newlands 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. Hence called law of octaves.

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

The discovery of which of the following group of elements gave a death blow to the Newland's Law?

  1. Inert gases

  2. Alkali metals

  3. Transuranic element

  4. Halogens
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The discovery of zero group of elements (inert gases) gave a death blow to the Newland's Law.
According to Newlands Law of octaves, when the elements are arranged in the increasing order of atomic weights, the properties of every eighth element are similar to the first one.


Hence, the correct option is $\text{A}$

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

Which of the following pairs of elements do not follow octave rule?

  1. $Be, B$
  2. $Ca, Sr$
  3. $F, Cl$
  4. $O, S$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The octet rule in chemistry refers to the tendency of atoms to prefer to have eight electrons in the valence shell. Beryllium (Be) and Boron (B) are electron-deficient elements that often form compounds with fewer than eight valence electrons, thus failing to follow the octet rule.