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# electronic configuration watch

1. Ion X+3 has the following electronic configuration 1s2 2s2 2p6 . Which group and which period of periodic table does this element belong?
2. What part of this are you struggling with? We're not going to just do your homework for you.

The ion has a charge of 3+, thus there have been 3 elections removed from the outer shell.

The inner shell is full and irrelevant here.

The 2nd shell is also full with 8 electrons in total.

You will need to add 3 electrons to this configuration in order to balance the positive charge, this is because 1 electron has a charge fo -1, so 3 electrons = -3. Applying thst to X^+3, you'll adding 3 electrons (ie 3 negetive charges) you''ll balance the charge and you get X, which is how it would appear in the periodic table.

hint: (you'l need to add another shell). Use this guide if you are unsure how to do it
https://en.wikibooks.org/wiki/Genera...e_of_Stability
3. (Original post by Et Tu, Brute?)
What part of this are you struggling with? We're not going to just do your homework for you.

The ion has a charge of 3+, thus there have been 3 elections removed from the outer shell.

The inner shell is full and irrelevant here.

The 2nd shell is also full with 8 electrons in total.

You will need to add 3 electrons to this configuration in order to balance the positive charge, this is because 1 electron has a charge fo -1, so 3 electrons = -3. Applying thst to X^+3, you'll adding 3 electrons (ie 3 negetive charges) you''ll balance the charge and you get X, which is how it would appear in the periodic table.

hint: (you'l need to add another shell). Use this guide if you are unsure how to do it
https://en.wikibooks.org/wiki/Genera...e_of_Stability

Is this element sodium?
4. (Original post by BioOx)
Is this element sodium?
No. Sodium doesn't form a stable 3+ ion.
If X3+ has a particular electron configuration then X will have 3 more electrons that its ion.
5. (Original post by BioOx)
Is this element sodium?
Why do you think it is sodium? Elementary sodium as 11 electrons, so an Na3+ ion was wouldn't have the structure 1s22s22p6

I think you really need to brush up on the basics of electronic structure.

The ion has the structure:

X^3+ = 1s22s22p6

Therefore adding 3 electrons to balance the positive charge gives you

X = 1s22s22p63s?3p?

You can do this simply by adding all of the electrons in the X3+ and then adding 3 electrons:

X3+ + e- = X2+
X2+ + e- = X+
X+ + e- = X

You started with X3+ = 1s22s22p6 , which is a total of how many electrons?

Add 3 electrons to that, then find which element has that number of electrons on the periodic table.
6. (Original post by Et Tu, Brute?)
Why do you think it is sodium? Elementary sodium as 11 electrons, so an Na3+ ion was wouldn't have the structure 1s22s22p6

I think you really need to brush up on the basics of electronic structure.

The ion has the structure:

X^3+ = 1s22s22p6

Therefore adding 3 electrons to balance the positive charge gives you

X = 1s22s22p63s?3p?

You can do this simply by adding all of the electrons in the X3+ and then adding 3 electrons:

X3+ + e- = X2+
X2+ + e- = X+
X+ + e- = X

You started with X3+ = 1s22s22p6 , which is a total of how many electrons?

Add 3 electrons to that, then find which element has that number of electrons on the periodic table.
I found it it's aluminum right?
7. (Original post by BioOx)
I found it it's aluminum right?
yes.

But do you understand it?
8. Yes now!!! Thank you

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