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Sodium Iodide. Can anyone help?

12 replies

Davespecifico · 05/05/2020 22:01

Have just spent ages googling multiple combinations of key words and found nothing. Can anyone help? See pic.

Sodium Iodide. Can anyone help?
OP posts:
StrawberryPi · 05/05/2020 22:03

Where is this question from/what is it for?

Davespecifico · 05/05/2020 22:08

It’s year 9 Chemistry Homework.

OP posts:
jackparlabane · 05/05/2020 22:09

Assuming this is GCSE level chemistry, it'll be something like explaining sodium has one electron in its outer shell but is more stable without it as Na+, iodine is more stable with an extra electron as I- (+ and - should be superscript) so they form an ionic bond with Na giving an electron to I.

Look up ionic bonding - NaCl would be the usual example.

jackparlabane · 05/05/2020 22:10

They need to recognise that iodine is in the same Group as chlorine, fluorine, and bromine so forms iodide in the same way.

Davespecifico · 05/05/2020 22:11

Thanks jackparlabane. I’ve looked a lot at ionic bonding, but they never seem to give this particular example. It’s always sodium chloride.

OP posts:
PolkadotsAndMoonbeams · 05/05/2020 22:13

Have they been learning about crystal structures? I wonder whether they're meant to draw a little diagram showing the "rock salt" structure, where you have an alternating network of Na and I.

PolkadotsAndMoonbeams · 05/05/2020 22:15

Like, this but replace Cl with I. They're in the same group so will bond in the same way.

Sodium Iodide. Can anyone help?
ErrolTheDragon · 05/05/2020 22:21

Have they been learning about crystal structures? I wonder whether they're meant to draw a little diagram showing the "rock salt" structure, where you have an alternating network of Na and I.

I don't think that's what they'd be looking for in a question about the atoms reacting.
As PP have said, it's analogous to sodium chloride.

PolkadotsAndMoonbeams · 05/05/2020 22:35

I just wondered because it said 'atoms' of each, so it's not just

Na+ + I- --> NaI

I can't remember when they do structures of metals, salts and organic compounds though, so might be barking up completely the wrong tree!

randomguy12 · 05/05/2020 23:26

One Sodium atom loses one electron to form an Na+ ion. This electron is transferred to the iodine atom, which gains one electron to form an I- ion. Strong electrostatic force of attraction between the oppositely charged Na+ and I- ion, and since one Na+ ion reacts with one I- ion, this forms a giant ionic lattice of NaI.

HarveySchlumpfenburger · 05/05/2020 23:30

Agree with PPs, it’s an ionic bonding question.

ErrolTheDragon · 05/05/2020 23:33

This is probably the relevant page from Bitesize

www.bbc.co.uk/bitesize/guides/ztc6w6f/revision/1

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