Unit #4THE PERIODIC TABLE

4.6 - Ions

This table summarizes the charge of ions formed by Representative elements.

Group Number of valence electrons
gain or lose electrons
charge of ions
examples
IA
1
lose 1 electron
+1
H+, Li+, Na+, K+
IIA
2
lose 2 electrons
+2
Mg+2, Ca+2, Sr+2
IIIA
3
lose 3 electrons
+3
Al+3, Ga+3
IVA
4
lose 4 electrons
gain 4 electrons
+4
-4
Sn+4, Pb+4
C-4
VA
5
gain 3 electrons
-3
N-3, P-3
VIA
6
gain 2 electrons
-2
O-2, S-2
VIIA
7
gain 1 electron
-1
F-, Cl-
VIIIA
8
 Complete octet makes the noble gases unreactive

 


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