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Question 4.8: Identifying Protons and Neutrons in Isotopes The element neo...

Identifying Protons and Neutrons in Isotopes

The element neon has three naturally occurring isotopes: Ne-20, Ne-21, and Ne-22. State the number of protons and neutrons in these stable isotopes of neon.

a. {}^{20}_{10}Ne             b. {}^{21}_{10}Ne            c. {}^{22}_{10}Ne

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Atomic
Number		 Mass
Number		 Number of
Protons		 Number of
Neutrons
ANALYZE THE
PROBLEM		 number in
lower left
corner		 number in
upper left
corner		 equal to
atomic
number		 equal to mass
number – number
of protons

In the atomic symbol, the mass number is shown in the upper left corner of the symbol, and the atomic number is shown in the lower left corner of the symbol. Thus, each isotope of Ne, atomic number 10, has 10 protons. The number of neutrons is found by subtracting the number of protons (10) from the mass number of each isotope.

Isotope Atomic
Number		 Mass
Number		 Number of
Protons		 Number of
Neutrons
a. {}^{20}_{10}Ne 10 20 10 20 – 10 = 10
b. {}^{21}_{10}Ne 10 21 10 21 – 10 = 11
c. {}^{22}_{10}Ne 10 22 10 22 – 10 = 12

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