Compare and contrast the arrangement of elements in Mendeléev’s Periodic Table and the Modern Periodic Table.
Compare and contrast the arrangement of elements in Mendeléev’s Periodic Table and the Modern Periodic Table.
| Mendeleev's periodic table | Modern periodic table | ||
| $1.$ | Elements are arranged in the increasing order of their atomic masses. | $1.$ | Elements are arranged in the increasing order of their atomic numbers. |
| $2.$ | There are a total of $7$ groups (columns) and $6$ periods (rows). | $2.$ | There are a total of $18$ groups (columns) and $7$ periods (rows). |
| $3.$ | Elements having similar properties were placed directly under one another. |
$3.$ | Elements having the same valence shell are present in the same period while elements having the same number of valence electrons are present in the same group. |
| $4.$ | The position of hydrogen could not be explained. | $4.$ | Hydrogen is placed above alkali metals. |
| $5.$ | No distinguishing positions for metals and non-metals. | $5.$ | Metals are present at the left hand side of the periodic table whereas non-metals are present at the right hand side. |
Similar Questions
The position of three elements $A$, $B$ and $C$ in the Periodic Table are shown below
Group $16$
Group $17$
-
-
-
$A$
-
-
$B$
$C$
$(a)$ Will $C$ be larger or smaller in size than $B$ ?
$(b) $ Which type of ion, cation or anion, will be formed by element $A$ ?
The position of three elements $A$, $B$ and $C$ in the Periodic Table are shown below
| Group $16$ | Group $17$ |
| - | - |
| - | $A$ |
| - | - |
| $B$ | $C$ |
$(a)$ Will $C$ be larger or smaller in size than $B$ ?
$(b) $ Which type of ion, cation or anion, will be formed by element $A$ ?
Which of the following statements is not a correct statement about the trends when going from left to right across the periods of periodic Table.
Which of the following statements is not a correct statement about the trends when going from left to right across the periods of periodic Table.
How could the Modern Periodic Table remove various anomalies of Mendeléev’s Periodic Table ?
How could the Modern Periodic Table remove various anomalies of Mendeléev’s Periodic Table ?
In the Modern Periodic Table, which are the metals among the first ten elements ?
In the Modern Periodic Table, which are the metals among the first ten elements ?
Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves ? Compare and find out.
Did Dobereiner’s triads also exist in the columns of Newlands’ Octaves ? Compare and find out.