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Question
An element with atomic number 17 is placed in the group 17 of the long form periodic table. Element with atomic number 9 is placed above and with atomic number 35 is placed below it. Element with atomic number 16 is placed left and with atomic number 18 is placed right to it. Which of the following statements are correct:
(i) Valency of the element with atomic number 18 is 0
(ii) Elements with same valency have atomic number 16, 17 and 18
(iii) Valency of elements with atomic number 9, 17 and 35 is one
(iv) Element with atomic number 17 is more electronegative than elements with atomic number 16 and 35
An element with atomic number 17 is placed in the group 17 of the long form periodic table. Element with atomic number 9 is placed above and with atomic number 35 is placed below it. Element with atomic number 16 is placed left and with atomic number 18 is placed right to it. Which of the following statements are correct:
(i) Valency of the element with atomic number 18 is 0
(ii) Elements with same valency have atomic number 16, 17 and 18
(iii) Valency of elements with atomic number 9, 17 and 35 is one
(iv) Element with atomic number 17 is more electronegative than elements with atomic number 16 and 35
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Solution
The correct option is B (i), (iii), and (iv)
The element with the atomic number 18 is argon. It is a noble gas and belongs to zero group or 18th group. It has its octet complete and so the valency is zero. Elements with atomic number 9, 17 and 35 are F, Cl and Br. They are all halogens and belong to group 17. All halogens have valency 1. As the atomic size increases, electronegativity decreases. In a period moving left to right, electronegativity increases and in a group, on moving down, it decreases. Thus, 17 is more electronegative than 16 and 35.
Hence, the correct option is b.
The element with the atomic number 18 is argon. It is a noble gas and belongs to zero group or 18th group. It has its octet complete and so the valency is zero. Elements with atomic number 9, 17 and 35 are F, Cl and Br. They are all halogens and belong to group 17. All halogens have valency 1. As the atomic size increases, electronegativity decreases. In a period moving left to right, electronegativity increases and in a group, on moving down, it decreases. Thus, 17 is more electronegative than 16 and 35.
Hence, the correct option is b.
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