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.)
$N(7)$ $F(9)$ $P(15)$ $Ar(18)$
$(a)$ 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 $17$ |
| - | - |
| - | $A$ |
| - | - |
| $B$ | $C$ |
$(a)$ Will $C$ be larger or smaller in size than $B$ ?
$(b) $ Which type of ion, cation or anion, will be formed by element $A$ ?
Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common ?
Helium is an unreactive gas and neon is a gas of extremely low reactivity. What, if anything, do their atoms have in common ?
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 ?
Element $X$ forms a chloride with the formula $XCl_2$, which is a solid with a high melting point. $X$ would most likely be in the same group of the Periodic Table as
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What were the limitations of Dobereiner’s classification ?
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