Question 2.5: How many neutrons are in each isotope of oxygen? Write the s...
How many neutrons are in each isotope of oxygen? Write the symbol of
each isotope.
(a) Oxygen-16 (b) Oxygen-17 (c) Oxygen-18
Strategy
Each oxygen atom has 8 protons. The difference between the mass number and the number of protons gives the number of neutrons.
(a) Oxygen-16 has 16 – 8 = 8 neutrons. Its symbol is _{8}^{16}O.
(b) Oxygen-17 has 17 – 8 = 9 neutrons. Its symbol is _{8}^{17}O.
(b) Oxygen-18 has 18 – 8 = 10 neutrons. Its symbol is _{8}^{18}O.
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