Atoms And Elements Worksheet Page 5
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18Worked Example 2-2
The nucleus of an atom contains 15 protons and 16 neutrons. Write the symbol for
the atom.
Solution
The atomic number equals the number of protons (15) and the mass number
equals the sum of the protons and neutrons (15 + 16 = 31).
The element with an atomic number of 15 is phosphorous (see the periodic table).
Therefore the symbol of the atom is
mass number
31
P
15
atomic number
Practice 2-2
The nucleus of an atom contains 27 protons and 33 neutrons. Write the symbol for
the atom.
Answer
The atomic number equals the number of protons (27) and the mass number
equals the sum of the protons and neutrons (27 + 33 = 60).
The element with an atomic number of 27 is cobalt (see the periodic table).
Therefore the symbol of the atom is
mass number
60
Co
27
atomic number
2-5
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