Question

Two elements y and n have atomic number 11 and 17 respectively which will form cation and which will form anion and why​

Answer 1

Answer:

Here is ur answer mate...

Sodium has atomic number 11 and it will cation because it has valency 1+

On the other hand chlorine has atomic number 17 and it will form anion as it has valency 1-

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Answer 2

Answer: Sodium is cation and Chlorine is anion.

Explanation: The first shell of an atom can hold 2 electrons and second shell can hold 8 electrons. In case of Sodium it's electronic configuration is 2,8,1 (as its atomic number is 11 ). Here one electron is extra in last shell ie, the valence elecrons is 1. So it is a cation and is +1 (in case of valency + and - is not an issue but in ions + and - is important ). Chlorine has electronic configuration as 2,8,7. Here one electron is less in the last shell so it is having -1 charge and is an anion. It's valency is also 1 but charge is different from Sodium .