Page 508 - Canadian BC Science 9

Names, Formulas and Charges of Some Common Polyatomic Ions
Electron Arrangements of the First 20 Elements
Table 1 Common Polyatomic Ions
Name
acetate
ammonium carbonate
chlorate
chlorite
chromate
cyanide
dichromate hydrogen carbonate hydrogen sulphate hydrogen sulphide hydrogen sulphite hydroxide hypochlorite
nitrate
nitrite perchlorate permanganate phosphate phosphite sulphate sulphite
Table 2 Electron Arrangements
Formula
CH3COO􏰂 NH4􏰃
CO32􏰂
ClO3􏰂
H He
Atom
1p 2p
3p 4p 5p 6p 7p 8p 9p 10 p
11 p 12 p 13 p 14 p 15 p 16 p 17 p 18 p
19 p 20 p
Ion
1 H􏰃 1 p 0 H􏰂 1 p 2
ClO2􏰂 Li
CrO42􏰂 Be
CN􏰂 B
Cr2O72􏰂 C
2
2,1 2,2 2,3 2,4 2,5 2,6 2,7 2,8
2,8,1 2,8,2 2,8,3 2,8,4 2,8,5 2,8,6 2,8,7 2,8,8
2, 8, 8, 1 2, 8, 8, 2
He does not form an ion Li􏰃 3p 2
Be2􏰃 4p 2 B3􏰃 5p 2 C4􏰂 6p 2,8 N3􏰂 7p 2,8 O2􏰂 8p 2,8
F􏰂 9p 2,8 Ne does not form an ion
HCO3􏰂 N 􏰂
HSO4 O HS􏰂 F HSO3􏰂 Ne OH􏰂
ClO􏰂 Na NO3􏰂 Mg
NO2􏰂 Al ClO4􏰂 Si
MnO4􏰂 P
PO43􏰂 S
PO33􏰂 Cl
SO42􏰂 Ar SO32􏰂
K Ca
Na􏰃 11 p Mg2􏰃 12 p Al3􏰃 13 p Si4􏰂 14 p P3􏰂 15 p S2􏰂 16 p Cl􏰂 17 p
2,8 2,8 2,8 2,8,8 2,8,8 2,8,8 2,8,8
Ar does not form an ion K􏰃 19 p 2, 8, 8
Ca2􏰃 20 p 2, 8, 8
Folding a Round Filter Paper
12345
1. Fold the round pieces of filter paper in half.
6. Place the cone of filter paper into a funnel and slightly dampen it.
2. Crease the fold.
6
3. Fold the paper in half again and crease it to produce a quarter circle.
4. Separate
one outer layer of paper from the other three.
5. Make the
opening wider by squeezing slightly together at the creases.
490
MHR • Science Skill 10