Download Atomic Numbers Practice Problems

Advanced Chemistry I
Atomic Numbers Practice Problems
Basic Problems
1. What is the mass number of an atom that has 11 protons and 13 neutrons?
2. Use the given information to fill in the blanks in the table below:
Element
Symbol
# of p+
# of n0
# of eAtomic Number
Oxygen
Silicon
Aluminum
Iron
O
Si
Al
Fe
8
14
Calcium
Copper
Magnesium
Ca
Cu
Mg
20
29
Gold
Au
79
Silver
Ag
Mass Number
8
14
14
13
16
28
13
26
56
40
35
29
12
24
197
61
47
Atomic Symbols
3. Write the chemical symbol for atom Y, which has 27 protons and a mass number of 59.
4. Write the chemical symbol for atom X, which has 84 protons and 125 neutrons.
5. Write the chemical symbol for atom Z, which has 73 electrons and 108 neutrons.
6. Fill in the table below using the atomic symbol data given:
Atomic
Atomic
Number of
Symbol
Number
Mass
Protons
12
6C
40
18Ar
127
53I
23
11Na
20
10Ne
48
22Ti
238
92U
Number of
Neutrons
Number of
Electrons
Isotopes
7. With respect to the three fundamental particles of atoms, which numbers of particles are the same
between two isotopes, and which ones are different?
8. Use one sentence to explain why some isotopes are radioactive, and some are not.
Bonus: Which two of the following are isotopes of element X?
46 X
20
20 X
46
43 X
20
46 X
43