Answer
a.
Number of protons = 35
Number of neutrons = 44
Number of electrons = 35
b.
Number of protons = 35
Number of neutrons = 46
Number of electrons = 35
c.
Number of protons = 94
Number of neutrons = 145
Number of electrons = 94
d.
Number of protons = 55
Number of neutrons = 78
Number of electrons = 55
e.
Number of protons = 1
Number of neutrons = 2
Number of electrons = 1
f.
Number of protons = 26
Number of neutrons = 30
Number of electrons = 26
Work Step by Step
a.
Number of protons = atomic number of Br = 35
Number of neutrons = atomic mass - number of protons = 79-35 = 44
Number of electrons = number of protons = 35
b.
Number of protons = atomic number of Br = 35
Number of neutrons = atomic mass - number of protons = 81-35 = 46
Number of electrons = number of protons = 35
c.
Number of protons = atomic number of Pu = 94
Number of neutrons = atomic mass - number of protons = 239 - 94 =145
Number of electrons = number of protons = 94
d.
Number of protons = atomic number of Cs = 55
Number of neutrons = atomic mass - number of protons = 133 - 55 = 78
Number of electrons = number of protons = 55
e.
Number of protons = atomic number of H = 1
Number of neutrons = atomic mass - number of protons = 3 - 1 = 2
Number of electrons = number of protons = 1
f.
Number of protons = atomic number of Fe = 26
Number of neutrons = atomic mass - number of protons = 56 - 26 = 30
Number of electrons = number of protons = 26
