Question

2) The element "A" having electronic configuration (2 8.7) on that basis answer the following Question.1) Identify element "A" and writ its symbol.
2) What is the valency of element ?​

Answer 1

Answer:

The element "A" having electronic configuration (2 8.7) on that basis answer the following Question.1) Identify element "A" and writ its symbol.

2) What is the valency of element ?

Explanation:

I don't have any answer

Answer 2

Answer:

1] ⇒ 2+8+7 = 17. Therefore, the atomic number of this element is 17 and the element is chlorine. It would be chemically similar to F(9) with configuration as 2, 7.

2] Complete step by step solution:

-So, the number of electrons present in an atom = 2+8+7 = 17. -Therefore the atomic number of the element is equal to 17. -The element having atomic number 17 is Chlorine. -The valence electrons in chlorine are 7.

Explanation:

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