Answer
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
