## Chemistry 9th Edition

Published by Cengage Learning

# Chapter 2 - Atoms, Molecules, and Ions - Exercises: 60

#### Answer

In a Carbon-12 atom , there are: $\Longrightarrow$ 6 protons $\Longrightarrow$ 6 neutrons $\Longrightarrow$ $6$ $electrons$, assuming that the atom is neutral, In a Carbon-14 atom, there are: $\Longrightarrow$ 6 protons $\Longrightarrow$ 8 neurons $\Longrightarrow$ 6 electrons, assuming that the atom is neutral.

#### Work Step by Step

Carbon has atomic number = Z = 6 Since number of protons = atomic number, Number of protons in both Carbon-12 and Carbon-14 are same, and = 6. Also, when the atom is neutral, number of protons = number of electrons ( Since the positive and negative charges on protons and electrons respectively are equal and thus cancel out each other). Thus number of electrons of both Carbon-12 and Carbon-14 are = 6 In a Carbon-12 atom , Mass number = A = 12. Thus number of neutrons = A - Z = 12 - 6 = 6 Thus number of neutrons in Carbon-12 atom = 6 In a Carbon-14 atom, Mass number = A = 14. Thus, number of neutrons = A - Z = 14 - 6 = 8 Thus number of neutrons in Carbon-14 atom = 8

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