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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.)
$N(7)$ $F(9)$ $P(15)$ $Ar(18)$
Solution
$(a)$ The atomic number of this element is $17.$
$(b)$ It would be chemically similar to $F(9)$ with configuration as $2,\, 7$.
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)$ State whether $A$ is a metal or non-metal.
$(b)$ State whether $C$ is more reactive or less reactive than $A$.
