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).

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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