Why do we classify elements? 

Important Questions on Periodic Classification of Elements

MEDIUM

Science>Chemistry>Periodic Classification of Elements>Classification of elements

Write the reactions of ${\mathrm{F}}_2$ and ${\mathrm{Cl}}_2$ with water.

EASY

Science>Chemistry>Periodic Classification of Elements>Classification of elements

How does the ionisation energy of $1\mathrm{st}$ group elements vary ?

EASY

Science>Chemistry>Periodic Classification of Elements>Classification of elements

The characteristics of elements $\mathrm{X}, \mathrm{Y}$ and $\mathrm{Z}$ with atomic numbers, respectively, $33, 53$ and $83$ are:

MEDIUM

Science>Chemistry>Periodic Classification of Elements>Classification of elements

Write the name of the scientist who has given the octave rule for the classification of elements. Explain the octave rule.

EASY

Science>Chemistry>Periodic Classification of Elements>Classification of elements

Who proposed the law of Octaves? 

MEDIUM

Science>Chemistry>Periodic Classification of Elements>Classification of elements

The modern periodic table has been evolved through the early attempts of Dobereiner, Newland and Mendeleev. List one advantage and one limitation of all the three attempts.

MEDIUM

Science>Chemistry>Periodic Classification of Elements>Classification of elements

The first ionization energy of magnesium is smaller, as compared to that of elements $\mathrm{X}$ and $\mathrm{Y}$, but higher than that of $\mathrm{Z}$. The elements $\mathrm{X}, \mathrm{Y}$ and $\mathrm{Z}$, respectively, are :

EASY

Science>Chemistry>Periodic Classification of Elements>Classification of elements

A teacher asked to give an example for Dobereiner’s triad, Ramu wrote them as $“\mathrm{Li}, \mathrm{Na}, \mathrm{Mg}”$, In these three, identify which element does not belong to this triad?

HARD

Science>Chemistry>Periodic Classification of Elements>Classification of elements

What is Newlands’ Law of Octaves? What were the limitations of Newlands’ Law of Octaves? 
 

EASY

Science>Chemistry>Periodic Classification of Elements>Classification of elements

Among the following reactions of hydrogen with halogens, the one that requires a catalyst is:

MEDIUM

Science>Chemistry>Periodic Classification of Elements>Classification of elements

Write the name of the scientist who has given a triad law for the classification of elements. Explain the law of triad.

EASY

Science>Chemistry>Periodic Classification of Elements>Classification of elements

What were the criteria used by Mendeleev in creating his Periodic Table?

HARD

Science>Chemistry>Periodic Classification of Elements>Classification of elements

$\mathrm{B}$ has a smaller first ionization enthalpy than $\mathrm{B}\mathrm{e}$. Consider the following statement:
(I) it is easier to remove $2\mathrm{p}$ electron than$2\mathrm{s}$  electron
(II) $2\mathrm{p}$ electron of $\mathrm{B}$ is more shielded from the nucleus by the inner core of electrons than the $2\mathrm{s}$ electrons of $\mathrm{B}\mathrm{e}$
(III) $2\mathrm{s}$ electron has more penetration power than $2\mathrm{p}$ electron
(IV) atomic radius of $\mathrm{B}$ is more than $\mathrm{B}\mathrm{e}$
(atomic number $\mathrm{B}:5, \mathrm{B}\mathrm{e}=4$ )
The correct statements are.

EASY

Science>Chemistry>Periodic Classification of Elements>Classification of elements

State modern periodic law.

MEDIUM

Science>Chemistry>Periodic Classification of Elements>Classification of elements

Classification of elements helps us to

EASY

Science>Chemistry>Periodic Classification of Elements>Classification of elements

Law of octaves for the classification of elements was stated by:

EASY

Science>Chemistry>Periodic Classification of Elements>Classification of elements

Which of the following are the limitations of Dobereiner Classification?

EASY

Science>Chemistry>Periodic Classification of Elements>Classification of elements

Two elements A and B obey Newlands law of classification of elements. The elements between A and B are:

EASY

Science>Chemistry>Periodic Classification of Elements>Classification of elements

Classification of elements helps us to:

EASY

Science>Chemistry>Periodic Classification of Elements>Classification of elements

The Dobereiner's groups of elements are called_____.