The atomic number of an element is 17. Predic | vedclass

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(A) The electronic configuration of the element with atomic number $17$ is $2, 8, 7$. Since it has $7$ valence electrons,it needs $1$ electron to comp

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Valency

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(A) The electronic configuration of the element with atomic number $17$ is $2, 8, 7$. Since it has $7$ valence electrons,it needs $1$ electron to complete its octet. Therefore,its valency is $1$.$(b)$ It is a non-metal. Elements with $5, 6,$ or $7$ valence electrons have a tendency to gain electrons to achieve a stable configuration,which is a characteristic property of non-metals.$(c)$ It belongs to Group $17$ (Halogens). In a group,the atomic size increases down the group due to the addition of new shells. Since this element (Chlorine) is in the $3^{rd}$ period,it is smaller than the elements below it (like Bromine and Iodine) but larger than the element above it (Fluorine).

Group $16$	Group $17$
-	-
-	$A$
-	-
$B$	$C$

The atomic number of an element is $17$. Predict $(a)$ its valency,$(b)$ whether it is a metal or non-metal,$(c)$ its relative size with respect to other members of its group. Justify your answer in each case.

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An element $X$ has a mass number of $35$ and the number of neutrons is $18$. Determine the atomic number and electronic configuration of $X$. Also, identify the group number, period number, and valency of $X$.

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The position of three elements $A$, $B$, and $C$ in the Periodic Table are shown below:
Group $16$ Group $17$
- -
- $A$
- -
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$(b)$ State whether $C$ is more reactive or less reactive than $A$.

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