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Answer:

1. The element has an atomic number of 17 therefore it must be present in group 17 of the periodic table. Group 17 lies on right hand side of the periodic table which shows that A is a non-metal (non-metals are placed on the right hand side of the periodic table). This element is chlorine. The elements of group 17 are also called halogens.

Final answer: Option (C) is false.

Given that: We are given the atomic number of an element is 17.

To find: We have to find which of the following statements is false for this element.

(A) Its electronic configuration is 2,8,7

(B) It is non metallic element

(C) It is in group 7

(D) It is in period 3

Explanation:

• The element having atomic number 17 is lies in group 17 is a halogen atom. So option (C) It is in group 7 is false.

• Given that atomic number of an element is 17. The element is Chlorine.

Electronic configuration of given element,(Z=17) is 2,8,7.

So option (A) its electronic configuration is 2,8,7 is true.

• Atomic number of an element is 17 therefore it must be present in group 17 in periodic table.

Group 17 elements lies on right side of the periodic table which shows that given element is a non-metal.

Because non-metals are placed on the right side of the periodic table.

Hence option (B) it is non metallic element is true.

• Element with atomic number Z = 17 is present in group 17 and  period 3 of the periodic table. The element is Chlorine.

So option (D) It is in period 3 is true.

• Hence, option (C) is false.

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