The mass number of an atom of 14_{C is ________.} A)6 B)20 C)8 D)14 E)10

Name: The mass number of an atom of 14 C is ________. A)6 B)20 C)8 D)14 E)10
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The mass number of an atom is the sum of the number of protons and the number of neutrons in the nucleus. 14S1U1B1C has 14 protons (from the S), 1 neutron (from the U), 1 neutron (from the B), and 1 neutron (from the C). Therefore, the total number of nucleons (protons and neutrons) is 14+1+1+1=17, making the mass number 17.

The Mass Number of an Atom of 14C Is ________

The Mass Number of an Atom of 14_{C Is ________}