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Ions
Element Name
Element
Symbol
Ion Symbol
Atomic
Number
Isotope
Mass
# Protons
# Electrons
# Neutrons
hydrogen
H
H+1
Ca+2
1
1
40
1
0
0
30
47
23
46
Fe
108
Al
14
+3
oxygen
16
Cl -1
35
10
36
11
10
10
35
Mg
23
S
201
29
Fe +2
12
16
-2
mercury
45
56
78
27
35
Ions
1.
Define an ion:
2.
List the number of protons , electrons, and neutrons for the following positive ion and
atom.
40
40
20
20
Ca
Ca +2
protons
electrons
neutrons
A positive ions is called a:
3.
List the number of protons , electrons, and neutrons for the following negative ion and
atom.
19
9F
19
9
F -1
protons
electrons
neutrons
A negative ion is called an:
4. Do the numbers of protons for an ion differ from it’s neutral atom? Explain
5. Do the numbers of neutrons for an ion differ from it’s neutral atom? Explain
6. Do the numbers of electrons for an ion differ from it’s neutral atom? Explain
7. Do the atomic numbers for an ion differ from it’s neutral atom? Explain
8. Do the mass numbers for an ion differ from it’s neutral atom? Explain
9. Describe the difference between a neutral atom and a cation.
10. Describe the difference between a neutral atom and an anion.
Isotopes
1. Atoms are made up of subatomic particles, such as protons, neutrons, and electrons. The
nuclei of atoms that make up isotopes of an element differ. There are three known isotopes
of the element hydrogen. List the number of protons, electrons, and neutrons for each
isotope.
Protium
H
1
1
Deuterium
2
1
H
Tritium
3
1
H
protons
electrons
neutrons
2. Explain why the atomic mass of hydrogen is 1.0079g and not a whole number.
3. Which of the hydrogen isotopes is most abundant in nature. Explain
4. Do the numbers of electrons for neutral isotopes of the same element differ? Explain.
5. Do the numbers of protons for such isotopes differ? Explain
6. Do the numbers of neutrons for such isotopes differ? Explain
7. Do the atomic numbers of such isotopes differ? Explain
8. Do the mass numbers of such isotopes differ? Explain
9.The element neon consists of three isotopes whose masses are, respectively 20.0 g, 21.0 g,
and 22.0 g. The abundance of these isotopes are respectively 90.92%, 0.25 %, and 8.83%.
Just by looking at the percents, what is the approximate molar mass of neon.
10.The element boron consists of two isotopes of masses of 10.0 g and 11.0 g. The average
molar mass of boron is 10.83 g/mol. Which isotope is more abundant?