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in Atomic Structure by (49.4k points)
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The electronic configuration of an element X is 2, 8, 7. 

1. What is the atomic number of the element X? 

2. Is X metal or non-metal? 

3. What is the valency of X?

1 Answer

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Best answer

1. Z = 17 

2. Non-metal 

3. 1.

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