Question

HELP PLEASE?
Give the name and formula of the compound formed from the following elements.

(a) iodine and barium

name

formula

(b) sulfur and strontium

name

formula

(c) strontium and fluorine

name

formula

Answer 1

these are all ionic compounds, write \(cation\) + \(anion\)

Answer 2

what do you mean write cation and anion? like how do I write the name and formula?

Answer 3

for example, the first is "Barium fluoride"

barium makes a 2+ cation, and fluorine makes a -1 anion, the formula is \(BaF_2\)

Answer 4

damn it's iodine, but it's the same concept

Answer 5

So Iodine makes 1+?

Answer 6

iodine make a -1 anion

Answer 7

so would the formula be IBa?

Answer 8

no

Answer 9

ok please explain the cation and anion thingy. it really confuses me.

Answer 10

metals make cations (because they are less electronegative (recall the electronegativity trends of the periodic table)), elements on the right side of the periodic table make anions (typically). When you write the name you write the cation first, followed by the anion with the appropriate suffix.

Answer 11

so BaI2?

Answer 12

and the name is Barium diiodine?

Answer 13

the formula is correct, but the name is not. Since barium only makes a 2+ ion, it's redundant to specify the number of iodines because it can only be 2.

Answer 14

so dibarium Iodine?

Answer 15

no, \(BaI_2\)=barium iodide

Answer 16

well umm I typed in BaI2 and it said that is incorrect.

Answer 17

the suffix \(-ide\) is used for anions, but it's not the only one.

Answer 18

thats weird, because it's right look: http://en.wikipedia.org/wiki/Barium_iodide

Answer 19

ya like it says case sensitive and i did it correctly but BaI2 is somehow incorrect.

Answer 20

i had to put a space. thanks!!!! it sorta makes sense now.

Answer 21

good stuff you go it figured it out. no problem