# Chapter 2 Atoms, Molecules, and Ions - Study Questions - Page 95: 7

a) 12 protons, 12 electrons, 12 neutrons b) 50 protons, 50 electrons, 69 neutrons c) 90 protons, 90 electrons, 142 neutrons d) 6 protons, 6 electrons, 7 neutrons e) 29 protons, 29 electrons, 34 neutrons f) 83 protons, 83 electrons, 122 neutrons

#### Work Step by Step

Atomic numbers are taken from the periodic table. a) Mg: $p^+=e^-=Z=12$; $A=Z+n^0, A=24\rightarrow n^0=12$ 12 protons, 12 electrons, 12 neutrons b) Sn: $p^+=e^-=Z=50$; $A=Z+n^0, A=119\rightarrow n^0=69$ 50 protons, 50 electrons, 59 neutrons c) Th: $p^+=e^-=Z=90$; $A=Z+n^0, A=232\rightarrow n^0=142$ 90 protons, 90 electrons, 142 neutrons d) C: $p^+=e^-=Z=6$; $A=Z+n^0, A=13\rightarrow n^0=7$ 6 protons, 6 electrons, 7 neutrons e) Cu: $p^+=e^-=Z=29$; $A=Z+n^0, A=63\rightarrow n^0=34$ 29 protons, 29 electrons, 34 neutrons f) Bi: $p^+=e^-=Z=83$; $A=Z+n^0, A=205\rightarrow n^0=122$ 83 protons, 83 electrons, 122 neutrons

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