This type of compound contains only two different elements in any ratio. Since these compounds are ionic in nature, they typically contain a metal and a non-metal.
1. Write
down the name of the element with the lower electronegativity (usually a metal)
first.
2. Remove
the ending on the name of the second element (usually a non-metal) and add
“-ide” ending.
ex.(a)
KI potassium iodide
(b) AlCl3 aluminum chloride
(c) Na2S sodium sulfide
C4-
carbide
|
N3-
nitride
|
O2-
oxide
|
F-
fluoride
|
|
P3-
phosphide
|
S2-
sulfide
|
Cl-
chloride
|
|
As3-
arsenide
|
Se2-
selenide
|
Br-
bromide
|
|
|
Te2-
telluride
|
I-
iodide
|
|
|
|
At-
astatide
|
1. Write
down symbols for the two elements, in the order they appear in the name.
2.
Place the valence of the
first element above the first symbol.
3.
Place the valence of the
second element above the second symbol.
4.
Use the ‘criss-cross’
rule and write the numbers as subscripts.
5.
Reduce the subscript
numbers to the simplest ratio.
Ex.(a)
rubidium nitride Rb1 N3 ↝ Rb3N
b)
magnesium phosphide Mg2 P3 ↝ Mg3P2
(c)
calcium oxide Ca2 O2 ↝ Ca2O2 ↝ CaO
Want a bit more binary goodness? Check out this video.
Homework
Give the correct formula for the following. Do as many questions as it takes to get 10 correct.
1. sodium
sulfide
2. calcium
phosphide
3. hydrogen
iodide
4.
5. barium
oxide
6. potassium
oxide
7. barium
chloride
8. aluminum
oxide
9.
10. francium
oxide
11. silver
sulfide
12. zinc
chloride
13. calcium
iodide
14. rubidium
fluoride
15. calcium
chloride
16. silver
bromide
17. beryllium
fluoride
18. lithium
bromide
19. potassium
phosphide
20.
21. lithium
oxide
22. barium
bromide
23. aluminum
carbide
24. strontium
nitride
25.
26. magnesium
carbide
27.
28. zinc
nitride
29.
30.
Give the correct name for the following. Do as many questions as it takes to get 10 correct.
1. NaCl
2. MgO
3. CaO
4. BBr3
5. MgS
6. CaCl2
7. AlBr3
8. Rb4C
9. Al2O3
10. Li2O
11.
12. Be3P2
13. BeF2
14. AlCl3
15. HCl
16. SrCl2
17. Na2O
18. K3N
19. Li3P
20. BaF2
21. MgI2
22. K2S
23. SrO
24. Al2S3
25. SrF2
26. Ag2S
27. RbI
28. Al2O3
29. MgO
30. KBr
Answer Keys: