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.
Only one triad of Dobereiner’s triads exists in the columns of Newlands’ octaves. The triad formed by the elements Li, Na, and K of Dobereiner’s triads also occurred in the columns of Newlands’ octaves.
Dobereiner’s triads
$\begin{matrix}
Li & Ca & Cl \\
Na & Sr & Br \\
K & Ba & I \\
\end{matrix}$
Newlands’ octaves
| $H$ | $Li$ | $Be$ | $B$ | $C$ | $N$ | $O$ |
| $F$ | $Na$ | $Mg$ | $Al$ | $Si$ | $P$ | $S$ |
| $Cl$ | $K$ | $Ca$ | $Cr$ | $Ti$ | $Mn$ | $Fe$ |
| $Co$ and $Ni$ | $Cu$ | $Zn$ | $Y$ | $In$ | $As$ | $Se$ |
| $Br$ | $Rb$ | $Sr$ | $Ce$ and $La$ | $Zr$ | - | - |
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)$ State whether $A$ is a metal or non-metal.
$(b)$ State whether $C$ is more reactive or less reactive than $A$.
The position of three elements $A$, $B$ and $C$ in the Periodic Table are shown below
| Group $16$ | Group $17$ |
| - | - |
| - | $A$ |
| - | - |
| $B$ | $C$ |
$ (a)$ State whether $A$ is a metal or non-metal.
$(b)$ State whether $C$ is more reactive or less reactive than $A$.
Which element has
$(a)$ two shells, both of which are completely filled with electrons?
$(b)$ the electronic configuration $2,\,8,\,2 ?$
Which element has
$(a)$ two shells, both of which are completely filled with electrons?
$(b)$ the electronic configuration $2,\,8,\,2 ?$
An atom has electronic configuration $2$, $8$, $7$.
$(a)$ What is the atomic number of this element ?
$(b)$ To which of the following elements would it be chemically similar ?(Atomic numbers are given in parentheses.)
$N(7)$ $F(9)$ $P(15)$ $Ar(18)$
An atom has electronic configuration $2$, $8$, $7$.
$(a)$ What is the atomic number of this element ?
$(b)$ To which of the following elements would it be chemically similar ?(Atomic numbers are given in parentheses.)
$N(7)$ $F(9)$ $P(15)$ $Ar(18)$
Why do you think the noble gases are placed in a separate group ?
Why do you think the noble gases are placed in a separate group ?
What were the criteria used by Mendeléev in creating his Periodic Table ?
What were the criteria used by Mendeléev in creating his Periodic Table ?