#1 name the ions formed by these elements and classify them as anions or cations a. selenium b....
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#1 Name the ions formed by these elements and classify themas anions or cations
a. selenium
b. barium
c. phosphorus
selenide -2anion
barium ion +2cation phosphide ion -3
anion
#2How many electrons were lost or gainedto form these ions?
a. Fe3+
b. O2-
c. Cu+
3 lost
2 gained
1 lost
#3Key concept: Explain how the charges of Group A metal and nonmetal ions are related to their positions in the periodic table.
Group A elements
The charge onthe group A metalsis just the group number. The chargeon the non-metalsis the group numberminus 8
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4 Key concept: How are the charges of sometransition metal ions determined?
By how many electrons they lose. This cansometimes be more than one number for a given transition metal.(example Cr2+ and Cr3+)
5 Key concept: What are the usual endingsfor the names of polyatomic ions?
-ite or -ate
examples:
#6 What are the charges on ions of Group 1A, Group 3A(aluminum), andGroup 5A?
#7 How does a polyatomic anion differfrom a monatomic anion?
Hydroxide OH-1
Hydrogen sulfate HSO4-1
Nitrite NO2-1
Nitrate NO3-1
Chloride Cl-1
Oxide O-2
Carbonate CO3-2
polyatomic anionshave more than one
atom, monatomicanions have only one atom
#8 Write the symbol for the ion of each element. Classify the ion as an anion ora cation, and name the ion.
a. potassium: K+ cation; potassium ion
c. tin (2 electrons lost): Sn2+ cation; tin (II)
b. oxygen: O2- anion; oxide ion
f. cobalt (3 electrons lost): Co3+ cation; cobalt (III)
e. beryllium: Be2+ cation; beryllium ion
d. bromine Br- anion bromide ion
#9 Write the symbol or formula (includingcharges) for each of the following ions.
a. ammonium ion NH41+
b. tin (II) ion Sn2+
c. chromate ion CrO42-
d. nitrate ion NO31-